I\'m pretty confused about potential difference and electric/magnetic fields so

Question

I'm pretty confused about potential difference and electric/magnetic fields so any help is appreciated!

1. The potential difference across an (ideal) parallel plate capacitor with very small plate
separation is held fixed by a battery. The plates are pulled apart. What happens to the electric potential energy?

2. A capacitor is disconnected from a battery and stores electric potential energy U. The space between the plates is filled with a dielectric of constant K. What is the stored energy now?

3. You are at rest relative to the ground. A charged object moves past you and you detect its magnetic field. What happens if instead the object is stationary relative to the ground and you move?

4. Unlike electric field lines, magnetic field lines always form continuous loops. Why?

5. Unlike the electric force, the magnetic force does no work. Why?

6. An overhead cable carries an electric current from west to east. What is the direction of the magnetic field at the ground?

Explanation / Answer

energy and potenital are related by U = Vd

so as d increses, U also increases

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if energy is Uo, then new eenrgy U = k times of Uo

where k is dielectric constant

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same effects takes place, with same magnetic field

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since magnertic force acts only on moving charge

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