Test Academy | In meter bridge, an unknown resistance X has specific resistance S 1 = X π R 2 I , where R is radius and l is length. If length and radius both are doubled, new specific resistance is S1, 2S1, 4S1, S1/4

Question

In meter bridge, an unknown resistance X has specific resistance $S_{1} = \frac{X π R^{2}}{I},$ where R is radius and l is length. If length and radius both are doubled, new specific resistance is

Options :

S₁
2S₁
4S₁
S₁/4

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