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q14 is C - see my other replies :cake: remember - a charge moving in a magnetic field experiences a force - so when it is in the constant field the charges in the pendulum still experience a force - so there is still some charge separation ie an emf.

measurement of the emf will of course require an ext circuit with a voltmeter etc............ one way of looking at why the correct answer is C is that in such a circuit the area of the loop containing the pendulum, the connecting wires, voltmeter etc is changing....so there is a change in flux...

yes, that is true, an emf is induced across the ends of the pendulum ( as the charges in the pendulum are forced by the motor effect to move to opposite ends) ...so the answer is C, and not A as you stated earlier. Of course if it was a complete loop moving through the constant field then...