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The electric resistance of a certain wir...

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

A

the resistance will be halved and the specific resistance will remain unchanged.

B

the resistance will be halved and the specific. Resistancw will be doubled

C

the resistance and the specific resistance, will both remain unchanged

D

the resistance will be doubled and the specific resistance will be halved.

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