Maxine and Jerry are in a science lab trying to make a magnet. Maxine suggests stroking a piece of steel with a bar magnet in one direction. Jerry thinks it is better to stroke the piece of steel in both
directions with the bar magnet. Who is correct?

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e