Question

1.what happens to the resistance of a circuit if the current through it is doubled?

2. how does the resistance of a wire depend upon its radius?

Answer 1

1. Resistance of a circuit is independent of the current passing through it. It remains constant.

2. R = ρL/(πr²)
Resistance is inversely proportional to square of the radius of wire.

Answer 2

Answer:

If you are doubling the current, either you are doing if by increasing the voltage or by decreasing the resistance or by a combination of both. so the resistance will remain constant if current is boubled through doubling the voltage supply.