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6.  A conducting rod PQ of length 'l' connected to  a resistor R, is moved at a uniform speed v, normal to a uniform magnetic field B as shown in the figure.
(i)  Deduce the expression for the emf induced in the conductor.
(ii)  Find the force required to move the rod in the magnetic field.
(iii)  Mark the direction of induced current in the conductor.

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