A wire carrying a current of 4 A is in the form of a circle It is necessary to have a magnetic field of induction 10 5 T at the

Question

A wire carrying a current of 4 A is in the form of a circle It is necessary to have a magnetic field of induction 10 5 T at the centre The radius of the circle must be 1 0 08 cm 2 0 8 cm 3 8 cm 4 80 cm

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