# Questions tagged [electric-fields]

For questions that utilize the concept of electric fields (commonly denoted by the letter E), or for questions whose answers likely involve electric fields. More specific than the [electricity] tag, as questions about the phenomenon & theory of electricity do not necessarily involve the discussion of fields.

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### Potential at the centre of two concentric shells

The potential of the inner shell is 10V and that of the outer shell is 5V. The potential at the centre is given in the book to be 10V. I know that inside the shell potential should be constant but how ...
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### Force produced by an electron beam

Suppose an electron beam hits a positively charged plate, what is the force on the plate? I was thinking that the force on the plate is equal to the sum of the electric field produced by the plate at ...
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### Electric feild intensity due to charged ring [closed]

How to derive expression for electric feild intensity due to charged ring at a point not on its axis.
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### Fields and Conductors

Is it correct to say that the field exiting the conductor is less than the field entering the conductor as the internal field of the conductor due to the induced charges is opposite in direction?
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### If an object is enclosed within a metallic spherical shell having surface charge + q C. The object will carry charge - q C.?

I have doubt in the statement is there any link between surface charge and object enclosed within the shell. I think object in enclosed shell can have any charge +ve or -ve . Or it is due to the fact ...
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### Why are Electric Fields an exact differential?

{$\vec E$ - Electric Field Vector ; $x^2$ is $x$ raised to the power $2$} When finding the Potential Difference between two points in a non uniform electric field, the equation of $\vec E$ given in ...
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### My question is under electrostastics [closed]

A 60 microcoulomb charge is at the centre of a cube of side 10cm. What is the total flux through the cube?
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### Motion of charged particle in uniform magnetic field and a radially symmetric electric field

This question posted by me on MSE talks about a physics problem. This is what it was: (I hope someone can help me with this) Consider a region of 2-dimensional space with a uniform magnetic field of ...
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### Amount of current moving through wire induced by electric field

Suppose we have a copper wire (length 4cm). We bring a negative electric field nearby and it applies 20 N/C at one end of the wire (we'll call this end A). The electrons in the wire are repelled by ...
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### Deflection of charge towards current carrying wire [closed]

when a charge is projected in the direction opposite to a current carrying wire then how does the charge deflects ?
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### Why is electric field in an insulator non zero?

I had read from several sources that electric field inside a conductor is zero. This is attributed to the fact that the electrons are loosely bound to the nuclei and they are free to rearrange ...
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### Line integral of a point charge

I am trying to teach myself Electrodynamics through self-study of Griffiths' Introduction to Electrodynamics, and I am having difficulty with a calculation that involves a line integral of a point ...
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### Direction of electrical force in a Solenoid [closed]

Im having trouble understanding this task: Given a solenoid which has a magnetic field pointing into the paper (see attached image), what is the electrical force on a positive point charge inside ...
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### Electric field inside a charged conductor

Why is electric field inside a charged conductor always zero? In an uncharged conductor if an electric field is applied then the charges reconfigure themselves as to have no net electric field. In a ...
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### Equations with relevance to motion of a charged particle in attractive and repulsive field

I have three related questions on Rutherford scattering The first one is based on the derivation given here When momentum is conserved isn't angular velocity $\frac{d \theta}{dt}$ where $\theta$ is ...
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### What causes the charges in conductor to move towards lower potential terminal of cell [duplicate]

Whenever a conductor is connected to a cell,what causes the conventional positivecharges inside it to move towards the lower potential level of cell.. My question is whether the charges experience a ...
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### Is $\nabla \times \mathbf{D} = \vec{0}$ necesary to apply Gauss Law in $\mathbf{D}$?

Electrostatic scenario. My professor told me that to use Gauss Law (at least in it's integral form) to find a vector field $\mathbf{D}$, $\nabla \times \mathbf{D}$ must be $\vec{0}$. When we derived ...
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### How Electrostatic shielding works? [duplicate]

Why do we get a uniform charge distribution on outer surface of sphere irrespective of the position of charge inside the sphere?
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### Electric field outside a conductor

Say there is a conducting cylinder in a uniform external field. The charges on the cylinder surface will distribute and create a surface charge density. Is there any reason the charge density would ...
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### Can Electric field line form a right angle?

Can Electric field line form a right angle ? something that look like the letter L.. please be as rigorous as possible. Thanks in advance.
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### Dipole oscillators question from Feynman lectures 1.28-29

I am confused by the Feynman lectures Vol1Ch28-29. In all the pictures, there is an electric dipole oscillating vertically. We're assuming the intensity is $E^2$ and that in the far r limit $E$ ...
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### How do the electric field lines distribute inside a current carrying conductor?

We know that when we connect a conductor to a source of potential difference, an electric field is established inside the conductor. With the help of calculations which I show below, we can see that ...
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### How is it physically possible that the electric field of some charge distributions does not attenuate with the distance?

Let's consider for instance an infinite plane sheet of charge: you know that its E-field is vertical and its Absolute value is $\sigma / 2 \epsilon _0$, which is not dependent on the observer position....
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### How does electric and magnetic field interchanges in light propagation? [closed]

We know that magnetism is just a illusion created because of special relativistic effects and there is only electric field which is really there in reality. so how can we say that this imaginary ...
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### Current in a generator

According to the Faraday law, voltage will be induced in the generator when the the loop will move in a magnetic field. This voltage will cause the current in the circuit. My question is Do ...
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### How can a capacitor discharge if there is no field outside? [duplicate]

On RC circuit, capacitor discharges when the voltage supply is removed. But I've learned that the net electric field outside a charged capacitor is zero by gaussian surface and gauss law. I don't ...
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### Electric field and current

When we provide a potential difference in a circuit it does nothing more than provide an electric field to the conductor,When an electric field is provided in a conductor the free electrons move to ...
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### Why aren’t the electric and magnetic components of an EM wave complementary? [duplicate]

Every visualization of an electromagnetic wave is essentially some variation of this picture: In every one of these graphs, both the electric and magnetic components are shown as being sine waves ...
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### Electromagnetic waves produced from a sinusoidal current

Say I have an oscillating sinusoidal current flowing on the z-axis (say $I_0\sin{\omega t}$), in a straight line conductor. This current produces an alternating magnetic field in the azimuthal ...