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The magnetic field at the centre of a circular coil of turns and radius carrying a current of in tesla is
(a)
(b)
(c)
(d)
(e)

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Important Questions on Magnetic Effect of Current
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KEAM
IMPORTANT
Consider a circular loop of radius on the - plane carrying a steady current anticlockwise. The magnetic field at the center of the loop is given by

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IMPORTANT
The magnitude of a magnetic field at the centre of a circular coil of radius , having turns and carrying a current can be doubled by changing

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IMPORTANT
A long solenoid with turns per unit length carries a current of . The magnetic induction at one of the ends of the solenoid on its axis is nearly

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IMPORTANT
A coil of turns carrying a current of in a magnetic field of . The torque acting on the coil is
