Which of the following ate true? Select all that apply. The electric field from

Question

Which of the following ate true? Select all that apply. The electric field from an external charge cannot penetrate to the center of a block of iron. The net electric field inside a block of aluminum is zero under all circumstances. If the net electric field at a particular location inside a piece of metal is not zero, the metal is not in equilibrium. In equilibrium, there is no net flow of mobile charged particles inside a conductor. The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium.

Explanation / Answer

A conductor in static equilibrium has zero net electric field at all locations inside the surface, so 3 and 5 are true. If the condctor is not in static equilibrium, then a non-zero electric field can exist inside, so 2 is false. It is the net electric field that is zero- external fields ca penetrate conductors, but the shift of free charges in the conductor generates an electric field that exactly cancels the electric field , so 1 is false.If charges are flowing then there is a non zero E inside the conductor and is not in static equilibrium , so 4 is true. The correct answer is 3,4,5.

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