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an infinitely long thin conductor, shape...


an infinitely long thin conductor, shaped as shown, carries current. Each section is of the same length. The magnetic field at the point P due to the secion from `-oo` to A is B. The field at P due to the entire conductor is

A

zero

B

B

C

`sqrt(2)B`

D

`2B`

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The correct Answer is:
D
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