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Question

If a wire of resistance 10Ω is cut along its length such that its radius becomes half of it's value then what will be the new resistance?

A
20Ω
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B
30Ω
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C
40Ω
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D
60Ω
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Solution

The correct option is C 40Ω
R1R2=(r2r1)210R2=(r2r)2=(r2×1r)2
10R2=14
R2=40Ω

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