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Magnetic field at the centre of a circul...

Magnetic field at the centre of a circular of coil of radius R and carrying a current I is

A

2 R

B

R

C

3 R

D

R/2

Text Solution

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The correct Answer is:
D
Obtain the value of magnetic field B at distance x from the centre of the coil on the axis. Find the rate of change of B with respect to x=`"dB"/"dx"`. Putting the value of zero gives x=R/2
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