A copper wire of length 10m and radius (10−2/√π)m has electrical resistance of 10Ω. The current density in the wire for an electric field strength of 10(V/m) is:
A
106A/m2
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B
105A/m2
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C
10−5A/m2
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D
104A/m2
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Solution
The correct option is B105A/m2 Given L=10m,r=10−2√πm