Question

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then ______.

Options

• the resistance and the specific resistance, will both remain unchanged.
• the resistance will be doubled and the specific resistance will be halved.
• the resistance will be halved and the specific resistance will remain unchanged.
• the resistance will be halved and the specific resistance will be doubled.

Answer 1

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then the resistance will be halved and the specific resistance will remain unchanged.