A small coil c with n = 200 turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet the cross sectional area is a=1cm^2 length of arm oa of balance beam is l=30cm when there is no current in the coil the balance is in equilibrium. On passing a current i = 22ma through the coil the equilibrium is restored by putting additional weight of mass 60 mg on balance pan find the magnetic induction
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