Question

calculate resistivity of material of a wire 1 m long, 0.4 mm in diameter and have resistance of 2ohm.​

Answer 1

Explanation:

we know,

where is resistivity or specific resistance of material of the wire.

or, 2 = × 1/{4π × 10^-8}

or, 2 × 4π × 10^-8 = .

or, = 8π × 10^-8 ohm.m.