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Resistivity

A certain wir...

Question

A certain wire has a resistance R. The resistance of another wire identical with the first and having twice its diameter is;

A

0.25 R

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B

4 R

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C

0.5 R

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D

2 R

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Solution

The correct option is A
0.25 R

Thus, R2 = R₁/4 = 0.25 R₁

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