MJ13 P13 Q35 Railway Circuit Resistor | May/June 2013 | Cambridge A Level 9702 Physics

9702/13/M/J/13: The diagram shows a length of track from a model railway connected to a battery, a resistor and a relay coil. With no train present, there is a current in the relay coil which operates a switch to turn on a light. When a train occupies the section of track, most of the current flows through the wheels and axles of the train in preference to the relay coil. The switch in the relay turns off the light. Why is a resistor placed between the battery and the track?
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