Question

(b) When a potential difference 1.5 V is applied across a wire of length 0.2m and area of cross section 0.30 mm, a current of 2.4 A flows through the wire. If the number density of free electrons in the wire is 8.4 x 10" ma calculate the average relaxation time.​

Answer 1

Answer:

When 5V potential difference is applied across a wire of length 0.1m, the drift speed of electrons is 25 x 10-4ms-1 . If the electron density in the wire is 8 x 1028 m-3 the resistivity of the material is close to (a) 1.6 x10-8 Ωm (b) 1.6 x10-7Ωm (c) 1.6 x10-6 Ωm (d) 1.6 x10-5 ΩmRead more on Sarthaks.com - https://www.sarthaks.com/195494/when-potential-difference-applied-across-wire-length-the-drift-speed-electrons-25-10-4ms