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The magnetic field due to a current carr...

The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4cm from the centre is `54muT`. What will be its vlue at the centre of loop?

A

`200 mu T`

B

`250 mu T`

C

`125 mu T`

D

`75 mu T`

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The correct Answer is:
b
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