The current flowing in a circular coil of radius r and the magnetic field at the centre is b not at what distance from the centre the axis of the coil the magnetic field will be do not buy it
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The magnetic field induced at the centre of an orbit due to an electron revolving in the nth orbit of hydrogen atom is given by B = μ0in/(2rn) , where in is the current in the nth orbit, rn the radius of the nth orbit and μ0 the magnetic permeablity of free space. rn ∝ n2 in ∝ n−3 Therefore B ∝ n−5 So the answer is (b) n−5.
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