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Consider a long, straight wire of cross-...

Consider a long, straight wire of cross-sectional area A carrying a current i. Let there be n free electrons per unit volume. An observed places himself on a trolley moving in the direction opposite to the current with a moving in the direction opposite to the current with a speed `(v= i/nAe) and separated from the wire by a distance r. The magnetic field seen by the observer is very nearly

A

`(mu_(0)i)/(2pi r)`

B

zero

C

`(mu_(0)i)/(pi r)`

D

`((2 mu_0)i)/(pi r)`

Text Solution

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The correct Answer is:
A
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