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Q.

Resistivity of the material of a wire is 6 x 10-8 ohm-m and the intensity of electric field inside it is 12 x 10-6 V/m. if cross sectional area of the wire is 1 mm2 , the electric current flowing through it is

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a

0.5 A

b

1.2 A

c

0.4 A

d

0.02 A

answer is D.

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Detailed Solution

Current density j=Eρ=12×10−66×10−8A/m2=200A/m2∴i =jA=200×10−4Amp=0.02A
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Resistivity of the material of a wire is 6 x 10-8 ohm-m and the intensity of electric field inside it is 12 x 10-6 V/m. if cross sectional area of the wire is 1 mm2 , the electric current flowing through it is