Question

A wire of resistance 4.5 Ω and length 150 cm, has an area of cross-section of 0.04 cm². Calculate the sp. resistance of the wire.

Answer 1

l = 150 cm; a = 0.04 cm²; R = 4.5 Ω

Sp. resistance, \[\rho = \frac{Ra}{l}\]

\[= \frac{4.5 \times 0.04}{150}\]

\[= 0.0012\ \Omega\text{cm}\]