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1.
A copper disc of radius 
is rotated about its centre with 10 revolutions per second in a uniform magnetic field of 
with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is
is rotated about its centre with 10 revolutions per second in a uniform magnetic field of with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is
2.
In which of the following circuit is the current maximum just after the switch 
is closed
is closed
3.
O is the centre of two coplanar concentric circular conductors, A and B, of radii r and R respectively as shown in the figure. Here, r <<< R. the mutual inductance of the system of the conductors can be given by
