Two wires a and b have equal lengths and are made of same material. if the diameter of wire a is twice that of wire b, which has the greater extension for a given load?

It should be A.

Explanation:

Wire A and wire B are made from the same material and have the same length, however, wire A is wider which would allow more electricity or power to be transformed.

Unless im understanding your question wrong, but from what I do understand it is most likely A.

Hope this helps, could you mark me brainliest if it is right?

c) up is the direction the magnetic force is acting on the charge.