1.

The resistance of a wire of length 300m & cross-section 1 mm² & resistivity 1 x 10-7ohm is​

Answer»

d) 30 Ω

Resistance, R = frac{rho l}{A}

Length, l = 300 m

Cross-section area, A = 1.0 MM2 = 10-6 m2

Resistivity, rho = 1.0 × 10−7 Ωm

Resistance, R = frac{10^{-7} TIMES 300}{10^{-6}}

R = 30 Ω



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