1) 2014 S4 EOY P1 Q26

The diagram below shows a battery completing a circuit of a metal rod resting on two metal bars. The metal rod is located in a magnetic field that is directed perpendicularly into the page.

How will the metal rod move?

2) 2018 S4 EOY P1 Q30

The diagram below shows two different power transmission systems, X and Y, which transmit power to a heater with rating ‚"220 V, 484 W".

The total resistance of the transmission cables in both systems are 10 Ω.
In system Y, assume there is no power loss in the transformers and in the circuits P and Q.

What is the ratio of the power loss in transmitting power in system X to that in system Y?

3) A disc magnet has its poles on its opposing flat surfaces. An insulated copper wire XY was placed on top of the disc magnet as shown in the diagram.

The instant the wire was connected across a d.c. battery, the wire was observed to move in the direction of the arrow.

The statements below describe the direction of the magnetic field and the direction for the current in the wire XY. Which statement is consistent with the above observation?

4) An ideal transformer that is used to operate a 5.0 A, 800 V machine has 200 turns and 500 turns in its primary and secondary coils respectively. What are the current and voltage delivered by the alternating power source that is connected to the transformer?

5) The magnetic flux linkage through a coil varies with time as shown.

Which graph shows the variation with time of the e.m.f. generated by the coil?