# Tagged Questions

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

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### Applying Ampere's Law for Two Parallel Wires

This seems a simple question but I'm not able to understand it properly. Say we have two parallel wires carrying same current I in different directions. We need to calculate the magnetic field at any ...
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### Can I use an electromagnet as a shark repellent? [on hold]

I scuba dive, and also spearfish. Doing these sports in the ocean presents obvious challenges since Sharks exist in the ocean. I know about a product called shark shield which uses magnetism to ...
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### Mechanical, not voltage driven electron motion creating larger net electromagnetic force

Have mercy I'm a physician not a physicist. Electrons' Motion in an electromagnet is on the order of 10$^{-4}$ m/s. That charge can be mechanically rotated in a capacitor with a million times more ...
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### Why did Kepler thought that the Earth was hollow? [on hold]

I was researching a little about the theory of the hollow earth, since I am a mathematician I don't understand well about physics some famous scientific thought this namely Euler, Edmond Halley and ...
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### Does magnetic lines keep moving continuously once the magnetic field is created or they become static? [on hold]

Does magnetic lines keep moving from north pole to south pole outside the magnet and from south to north inside the magnet or they are static once they are created. If the move then why don't the iron ...
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### What is the relationship between the magnetic units oersted and tesla?

How are the units oersted and tesla related? For example, how would you express $20\:\mathrm{Oe}$ in tesla?
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### What force is needed to slide a plate off a magnet?

I have read related the wiki article but I am not able to find a solution to my problem: how to find the min force needed to separate a magnet. I suppose that the force exerted by one magnet is ...
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### Can Fluctuation-Dissipation Theorem Apply to Magnetic Forces in Multi-Spin Systems

Let's say I have multiple spin systems (atoms in a protein) in a solution of water and the spin systems are all producing a magnetic field $\mathrm{B_{loc}}$ that affects nearby spin systems. Will the ...
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### Is it necessary that the field in a top trap rotates? Difference top trap/Ioffe trap

Because of majorana losses it is necessary to add a bias field in order not to lose too many atoms. But it is it really necessary for the bias fiald to rotate like in a top trap or would it be enough ...
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### Motion of charged particle in uniform magnetic field

To create a uniform magnetic field I took a current carrying solenoid connected to a battery, then I took a long straight wire connected to another battery, the wire passes from inside the solenoid. ...
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### Charging Copper ball bearing

I want to conduct an experiment to observe the trajectory of charged particles in applied magnetic and electric field. Thus, I want to charge a copper bead/ball bearing. How can I electrically charge ...
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### Will rotating magnets slow down one another when interacting?

Will rotating magnets slow down one another when interacting? Two discs are spinning. Both have separate magnets attached. Disc one has a diameter of $8~\mathrm{cm}$ and disc two has a diameter ...
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### Does the direction of magnetic field in a solenoid point from north to south anywhere? [closed]

Is there any case where the direction of magnetic field inside a solenoid points from its North Pole to its south?
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### Find magnetic field of parabaloid-spiral particle path

Given the components of the particle's path (tcos(at), tsin(at), R(x^2 + y^2)), where a and R are constants, how can I find the magnetic force causing this? I would like to understand if this can be ...
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### What difference does it make if the turns in a tesla coil overlap?

Would a tesla coil in which the primary coil is made by overlapping the turns of the wire work?
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### Why do the magnetic poles of the Earth get reversed?

It has been confirmed that the magnetic poles of the Earth get reversed , but why should they get reversed in the first place ? Also, why is their pattern of reversal so arbitrary ? Geomagnetic ...