Question

If the radius of the wire of tesistance r is increased n times keeping mass constant, what will be its new resistance?​

Answer 1

Explanation:

When you do this, the resistance of a given length of wire (the original length) goes up by the change in length. But now the total resistance also goes up by the change in length.

So take the change in length, square it, and multiply that times the original resistance.

Rt=r×n^2