User Narendra Bista - Physics Stack Exchange most recent 30 from physics.stackexchange.com 2019-07-16T03:00:07Z https://physics.stackexchange.com/feeds/user/23886 http://www.creativecommons.org/licenses/by-sa/3.0/rdf https://physics.stackexchange.com/q/102699 3 What may be effect of air friction to the velocity of satellite? Narendra Bista https://physics.stackexchange.com/users/23886 2014-03-09T14:14:30Z 2019-03-06T17:17:04Z <p>What is the effect of air friction to the velocity of satellite? I have heard satellite's speed increases with air friction. But I'm in confusion how is it possible?</p> https://physics.stackexchange.com/q/66057 12 Can one of Newton's Laws of motion be derived from other Newton's Laws of motion? Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-27T08:53:38Z 2016-06-04T05:58:55Z <p>Can one derive Newton's</p> <p>second and third laws from the first law <strong>or</strong> </p> <p>first and third laws from the second law <strong>or</strong></p> <p>first and second laws from the third law</p> <p>I think Newton's laws of motions are independent to each other. They can not be derived from one another. Please share the idea.</p> https://physics.stackexchange.com/q/64993 4 Can a current carrying loop or wire produces no magnetic field? Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-18T04:46:45Z 2014-12-22T19:47:31Z <p>A current carrying wire produces magnetic field around it. We can find the direction by Fleming's Right hand rule. We know change in electric filed produces magnetic field and change on magnetic field produces electric field. It is mutual relationship. <strong>My question is that is there any condition such that current carrying loop or wire produces no magnetic field</strong></p> https://physics.stackexchange.com/q/154242 1 How is energy transferred in Joules law of heating? Narendra Bista https://physics.stackexchange.com/users/23886 2014-12-20T12:33:20Z 2014-12-20T12:58:47Z <p>Joule's law of heating states that an accelerated electron loses its energy, which is then converted into heat energy, by colliding with vibrating atom i.e ions in their lattice site. but we know atom consist of electrons and a nucleus. Where does it collide? How does energy get transferred?</p> https://physics.stackexchange.com/q/99137 3 Can a full image be made in mirror if we change the distance between object and mirror? Narendra Bista https://physics.stackexchange.com/users/23886 2014-02-14T05:11:44Z 2014-02-15T09:43:56Z <p>To see the full height of man, the height of mirror should be half of the height of the man. What happens when we decrease the distance between mirror and man?</p> https://physics.stackexchange.com/q/78741 0 What state is fire? Solid, Liquid or Gas or Plasma? [duplicate] Narendra Bista https://physics.stackexchange.com/users/23886 2013-09-27T09:15:19Z 2013-09-27T11:26:50Z <div class="question-status question-originals-of-duplicate"> <p>This question already has an answer here:</p> <ul> <li> <a href="/questions/23469/is-fire-plasma" dir="ltr">Is fire plasma?</a> <span class="question-originals-answer-count"> 5 answers </span> </li> </ul> </div> <p>What state is <a href="http://en.wikipedia.org/wiki/Fire" rel="nofollow">fire</a>? Solid, Liquid or Gas or Plasma? </p> <p>I was just roaming around when this question popped out of my mind. In what state is FIRE? </p> https://physics.stackexchange.com/q/71722 0 why does the phase change when wave reflects from rigid boundary [duplicate] Narendra Bista https://physics.stackexchange.com/users/23886 2013-07-21T01:31:52Z 2013-07-21T02:49:14Z <div class="question-status question-originals-of-duplicate"> <p>This question already has an answer here:</p> <ul> <li> <a href="/questions/32122/phase-shift-of-180-degrees-of-transversal-wave-on-reflection-from-denser-medium" dir="ltr">Phase shift of 180 degrees of transversal wave on reflection from denser medium</a> <span class="question-originals-answer-count"> 6 answers </span> </li> </ul> </div> <p>when the wave is reflected from open end there is no phase change but when it reflects from the rigid surface its phase changes.</p> <p>in open surface its phase change is 0 and in rigid surface its phase change is pi. How is it possible. Is is possible to reflect from open end.</p> https://physics.stackexchange.com/q/71721 -2 Temperature of rod if end points are different temperature [closed] Narendra Bista https://physics.stackexchange.com/users/23886 2013-07-21T01:27:04Z 2013-07-21T01:39:10Z <p>How does the temperature vary along the length of the rod if its both ends are at different temperature. As an example, consider the problem:</p> <blockquote> <p>20 cm long rod has rod at one end 100 ºC and another end at 0 ºC. Find the temperature at the center of the rod when it's in thermal steady state.</p> </blockquote> https://physics.stackexchange.com/q/71032 0 why is mass of air bubble in material medium considered to be negative? Narendra Bista https://physics.stackexchange.com/users/23886 2013-07-14T05:17:35Z 2013-07-14T07:19:42Z <p>The mass of air bubble in any medium is considered as negative. Is the air bubble is massless. I m in confusion. can we not neglect the mass of air bubble in material medium. But i have found in many books the mass of air bubble in material medium as negative. please discuss.....</p> https://physics.stackexchange.com/q/68338 0 In electrostatics total flux linked from the closed surface enclosing the charge is equal to $Q/\varepsilon_0$. This is according to Gauss Law Narendra Bista https://physics.stackexchange.com/users/23886 2013-06-17T11:41:41Z 2013-06-18T03:29:20Z <p>In electrostatics total flux linked from the closed surface enclosing the charge is equal to $Q/\varepsilon_0$. This is according to <a href="http://en.wikipedia.org/wiki/Gauss%27s_law" rel="nofollow">Gauss Law</a>. Is this the experimental value or defined value. If experimental what type of experiment is done by Gauss? Why this value is chosen?</p> https://physics.stackexchange.com/questions/66587/-/66590#66590 0 Answer by Narendra Bista for Conductors connected with a wire Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-31T12:12:56Z 2013-05-31T12:12:56Z <p>When two charged spheres are joined by wire then charge flows from high potential to lower one until they come to same potential. The sphere larger in size acquires more charge as it has higher capacitance. After joining by wire, electric filed will not be zero but electric field will change according to its capacitance and charge shared. At one point electric field of one sphere may be canceled by electric field of another. The point is termed as null point. but other points electric field is not zero being same potential. Charge distributes on outermost surfaces of spheres so connecting wire only provides path for charge transfer. Finally no charge resides on it. charges always resides so that potential energy of system remains minimum. To maintain minimum energy the charges always reside on outer surfaces....</p> https://physics.stackexchange.com/q/66460 -7 What is the sensation by man carrying a water bucker with an object floating in it? [closed] Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-30T12:08:02Z 2013-05-31T11:05:48Z <p>A man is carrying a bucket with water. If a object is kept in it which floats in water, man will feel</p> <p>1) heavier</p> <p>2) lighter</p> <p>3) none</p> <p>I think when the body floats its weight is balanced by upthrust so no further be felt. Is it right or wrong?</p> https://physics.stackexchange.com/q/65945 0 How can the accurate value of electric field intensity be calculated? Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-26T07:24:27Z 2013-05-26T19:33:28Z <p>When we calculate electric field intensity for a point charge at any point inside electric field the field intensity is $E = F/q$ where $F$ is the force acting on charge $q$. In this case, the charge $q$ should be very small. The practical value of $q$ cannot be so small as needed. In defining electric field by measuring value $F/q$ is smaller than the actual value.</p> <p><strong>My question:</strong> How can the accurate value of electric field intensity be calculated?<br> I'm quite confused. Can someone point me out?</p> https://physics.stackexchange.com/q/65621 2 How the value of permitivity of free space is determined? Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-23T13:13:09Z 2013-05-23T13:44:10Z <p>when electric charges are placed on the medium then force of interaction between them decreases. We say this factor permitivity of the medium. The force of interaction between the charges is max if the charges are at space or if there is absence of medium. We know the <a href="http://en.wikipedia.org/wiki/Vacuum_permittivity" rel="nofollow">electric permittivity of free space</a> is $8.85 * 10^{-12} F/m$. My question is how this value is determined. Is there any experiment held?</p> https://physics.stackexchange.com/q/65107 0 if a simple pendulum is dropped in a elevator with a acceleration greater than acceleration due to gravity then what will be its frequency Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-19T09:05:52Z 2013-05-19T09:16:50Z <p>if a simple pendulum is dropped in a elevator with a acceleration greater than acceleration due to gravity then what will be its frequency ? We know time period depends on frequency.</p> https://physics.stackexchange.com/questions/64964/-/64997#64997 -2 Answer by Narendra Bista for Force Between Two Conducting Spheres Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-18T05:33:34Z 2013-05-18T05:33:34Z <p>Your answer might be (1) i.e. equal to F. Physically no point charge exists because charge is not independent matter, it is just property of matter. Charge can not exists without mass. Charge on the spherical body is termed as point charge. We should not be confused point charge as point has no dimension.</p> <p>If spheres of same charge equal to point charge are placed at same distance apart, then force of intraction will be same as F. Charges are uniformly distributed on outer surface of sphere and distance from this charge measured from its center i.e. from the point so we consider it as point charge.</p> https://physics.stackexchange.com/q/64803 1 A rod of length $L$ & mass $M$ is rotating in a circle about one end then calculate tension in the rod at a distance $x$ from the support Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-16T12:19:44Z 2013-05-16T13:01:21Z <p>A rod of length L &amp; mass M is rotating in a circle about one end then calculate tension in the rod at a distance 'x' from the support ?</p> <p>For its solution why should we take mass of L-x portion of rod instead of taking mass upto x distance from support as we have the formula </p> <p>T = m w2 x I m in confusion....</p> https://physics.stackexchange.com/questions/63350/-/63351#63351 1 Answer by Narendra Bista for Apparent and real depth object in water Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-05T09:49:04Z 2013-05-05T09:49:04Z <p>we have the formula</p> <p>n = real depth/apparent depth</p> <p>so, real depth = n * apparent depth = 1.33 * o.4 = 0.532 so right ans may be D</p> <p>here n is refractive index of water with respect to air</p> https://physics.stackexchange.com/questions/63208/-/63340#63340 1 Answer by Narendra Bista for Definition of Static Electricity Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-05T07:47:14Z 2013-05-05T07:47:14Z <p>charge inside the conductor moves with random speed which is known as thermal speed. But average velocity made by the randomly moving charges is zero as they are not alined in the absence of external force i.e. voltage supply. static electricity also termed as electrostatics creates electric field, static charges resides on outer surface of the conductor</p> https://physics.stackexchange.com/questions/63300/-/63339#63339 1 Answer by Narendra Bista for Capacitor Charging and Discharging when connected to the ground Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-05T07:27:59Z 2013-05-05T07:33:28Z <p>For flow of charge, the circuit should be closed. In open circuit, no charge flows. If we connect both the capacitor plates it makes closed circuit, charge flows in the circuit, as a result charges on the plates neutralizes to zero.</p> <p>If only +ve plate of the capacitor is only connected to ground there is no closed circuit. no charges flows from the ground.</p> <p>If the circuit is closed and any one point on the circuit is connected to ground, then potential of that point becomes zero and potential of other points changes accordingly. ground potential is assumed to be zero as it is taken as reference point. Potential itself is not absolute value, it is relative value. the potential of same point may be different if we chose different reference points....</p> https://physics.stackexchange.com/questions/33699/-/63338#63338 0 Answer by Narendra Bista for When I connect two charged capacitors side by side, what will be the voltage across them? Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-05T06:41:24Z 2013-05-05T06:41:24Z <p>since circuit is open no charge is shared. if the circuit is closed ie capacitors are connected by conducting wire then charge will be shared. charge would flow from higher potential to lower until they come to common potential.</p> <p>In the given circuit no charge is shared and potential across both the capacitors remains same.</p> https://physics.stackexchange.com/questions/24782/-/63139#63139 1 Answer by Narendra Bista for What's the right way to calculate charge on a capacitor? Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-03T06:13:38Z 2013-05-03T06:13:38Z <p>Net charge on capacitor is always zero because there is equal and unlike charges on plates. Hence capacitor is not charge storing device. It is electrical energy storing device.</p> <p>In any form of capacitor, stored charge when charged by voltage V is q=cv where +cv is stored in one plate and -cv is stored in another plate.</p> <p>In this question charge stored should be: q = 4*10^-6 * 12 coulomb i.e q = 48 micro coulomb</p> https://physics.stackexchange.com/questions/61957/-/63014#63014 1 Answer by Narendra Bista for Why does the area of the plates affect the capacitance? Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-02T10:49:07Z 2013-05-02T12:31:03Z <p>The capacitance $C=\frac{Q}{U}$ is always constant for any types of capacitors. as $Q$ is increased $U$ also increase so that the fraction $C$ remains constant.</p> <p>capacitor is fixed for particular size of capacitor. greater the size of capacitor, greater will be its capacitance.</p> <p>Capacitance is analogous to the <em>capacitance of water tank</em> at our home. larger the size of tank, larger will be its capacitance despite the presence of water in tank or empty. An empty tank or water filled tank has same capacitance. similarly, whether the capacitor is charged or not charged its capacitance is always fixed. Capacitance is independent of charge and voltage raised due to this charge.</p> https://physics.stackexchange.com/questions/57500/-/63016#63016 2 Answer by Narendra Bista for Capacitance of a capacitor Narendra Bista https://physics.stackexchange.com/users/23886 2013-05-02T11:01:47Z 2013-05-02T12:30:51Z <p>as $C=E_0\cdot A / d$, the nearness of plates increases the capacitance. </p> <p>if d decrease, capacitance $C$ increases.</p>