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Electric Current

A conducting ...

Question

A conducting wire has electric resistance $‘ R^{'}$ . If the length of this wire and the area of the cross-section are halved, then what will be the new resistance of the wire?

A

R

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B

R / 2

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C

2 R

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D

4 R

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Solution

The correct option is A $R$
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Since both these quantities are halved, no effect is seen on the resistance

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