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Q.

A copper wire of length 10 m and radius 10−2/πm has electrical resistance of 10Ω. The current density in the wire for an electric field strength of 10 (V/m) is:

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a

105A/m2

b

104A/m2

c

106A/m2

d

10−5A/m2

answer is C.

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J=EIRA=105A/m2

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