A current of 5   A passes through a copper conductor (resistivity = 1.7 × 10 - 8   Ω…

A current of 5 A passes through a copper conductor (resistivity =1.7×10-8 Ω m ) of radius of cross-section  5 mm . Find the mobility of the charges if their drift velocity is  1.1×10-3 ms-1 .
  1. 1.5 m2 V-1 s-1
  2. 1.8 m2 V-1 s-1
  3. 1.0 m2 V-1 s-1
  4. 1.3 m2 V-1 s-1

Solution

Mobility μ=VdE
⇒μ=VdE=VdlV=VdliR=VdAliρl
μ=1.1×10-3×π5×10-325×1.7×10-8
=1.0 m2 V-1 s-1

Asked in: JEE Main 2019 (10 Apr Shift 1)

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