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Question: The dimensions of a block are 1 cm × 1 cm × 100 cm. If the specific resistance of its material is2 ×...

The dimensions of a block are 1 cm × 1 cm × 100 cm. If the specific resistance of its material is2 × 10–7 ohm × metre, then the resistance between the opposite rectangular faces is –

A

2 × 10–9 ohm

B

2 × 10–7 ohm

C

2 × 10–5 ohm

D

2 × 10–3 ohm

Answer

2 × 10–7 ohm

Explanation

Solution

R = ρlA\frac{\rho\mathcal{l}}{A} = ρ(1cm)(1cm×100cm)\frac{\rho(1cm)}{(1cm \times 100cm)}