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

1) The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium.

2) In equilibrium, there is no net flow of mobile charged particles inside a conductor.

3) If the net electric field at a particular location inside a piece of metal is not zero, the metal is not in equilibrium.

Explanation:

1) and 3) A block of copper is a conductor. The charged particles on a conductor in equilibrium are at rest, so the intensity of the electric field at all interior points of the conductor is zero, otherwise, the charges would move resulting in an electric current.

2) The charged particles on a conductor in equilibrium are at rest.

in physics zero. in muscle fatigue could be high