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Magnetic field due to a current carrying...

Magnetic field due to a current carrying wire loop along its axis can be calculated by

A

finding electric field of coll and then by using` E//B = C`

B

finding electric field of a small element of current carrying coll and then by using `E//B = C`

C

summing up the magnetic field of small elements IdI of the coll

D

finding magnetic field of a wire of length I and then by substituting `l=2pir`,r being radius of loop

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The correct Answer is:
C
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