A cylindrical conductor of diameter 0.1 m m carries a current of 90 m A . The current density (in A m - 2 ) is π ≃ 3

Question

A cylindrical conductor of diameter 0.1 m m carries a current of 90 m A . The current density (in A m - 2 ) is π ≃ 3, 1.2 × 10 7, 3 × 10 6, 6 × 10 6, 2.4 × 10 7

MARKS App · Accepted Answer

Given, The diameter of the cylindrical conductor D = 0 .01 m m Radius r = D 2 = 0 .1 2 m m Current I = 90 m A = 90 × 10 - 3 A We know that, Current density J = I A = I πr 2 = 90 × 10 - 3 22 7 × 0.1 × 10 - 3 2 2 = 90 × 10 - 3 3.14 × 0.1 × 10 - 3 2 2 = 12000 × 10 3 = 1.2 × 10 7 A m - 2

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