Answer if you know the answer only. This is test

Fuel, like diesel and propane, is too heavy for the Mars mission to carry much, if any, of it. So power is likely to be provided by a solar array instead of a generator. The energy collected from the solar arrays will be stored in large battery banks. Most of the circuits will have a load of about 12 Ω. If 4 A is needed to run the equipment, what voltage does the battery bank need to be?​

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0