A copper wire of length 10 m and radius 10 - 2 π m has electrical resistance of 10 Ω . The current density in the wire for an electric field strength of 10 V m - 1 is:

Question

A copper wire of length 10 m and radius 10 - 2 π m has electrical resistance of 10 Ω . The current density in the wire for an electric field strength of 10 V m - 1 is:, 10 6 A m - 2, 10 - 5 A m - 2, 10 5 A m - 2, 10 4 A m - 2

MARKS App · Accepted Answer

Length = 10 m Radius = 10 - 2 π m Electrical resistance = 10 Ω Electric field strength = 10 V m - 1 Current density, J = I A = V R A = E L R A ⇒ J = 10 × 10 10 × π 10 - 2 π 2 = 10 5 A m - 2

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