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Q.

The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil made from the same length of wire will be

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a

b

c

d

answer is B.

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Detailed Solution

Circular coil                     Square coil  Length L=2πr                 Length L = 4aMagnetic field at the centre of circular coil    Magnetic field at the centre of square coil
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