A metal rod of length 1 m is rotated about one of its ends in a plane at right angles to a uniform magneic field of `2.5 xx 10^-3` Wb `m^-2`. If its makes 30 r.p.s. Calculate the induced e.m.f. between its ends.

A metal disc of radius 200 cm is rotated at a constant angular speed of 60 rad s^-1 in a plane at right angles to an external field of magnetic induction 0.05 Wb m^-1 . Find the e.m.f. induced between the centre and a point on the rim.

A conductor of length 'l' is rotated about one of its ends at a constant angular speed omega in a plane perpendicular to a uniform magnetic field B. plot graphs to show variations of the emf induced across the ends of the conductor with length of the conductor l.

A conductor of length 'l' is rotated about one of its ends at a constant angular speed omega in a plane perpendicular to a uniform magnetic field B. plot graphs to show variations of the emf induced across the ends of the conductor with angular speed omega .

An electric dipole of length 2 cm is placed with its axis making an angle of 30^@ to a uniform electric field of 10^5NC^-1 . If it experiences a torque of 10sqrt3Nm , calculate the magnitude of the charge on the diple