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1 markInduced e.m.f.

CSEC Physics · May/June 2017 · Paper 2 · Question 1(c)(iii)

Kevin conducted an experiment on electromagnetic induction using a coil, galvanometer, connecting wires, and a bar magnet. Figure 1 shows the setup where the magnet is pushed into the coil with the north pole entering first.

Why is it necessary to use a sensitive galvanometer?

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  1. 1(a)Using a scale of 2 cm to 5 ms on the horizontal axis and 2 cm to 0.5 V on the vertical axis, plot the graph of induced e.m.f., V, versus time, ms, on the grid…[8 marks]
  2. 1(b)(i)Use your graph to determine the induced e.m.f. after 12.5 milliseconds.[1 mark]
  3. 1(b)(ii)Use your graph to determine the time, in milliseconds, other than at the beginning of the experiment when the induced e.m.f. was 0 volts.[1 mark]
  4. 1(c)(i)Draw on Figure 1 the direction of the induced current and the direction of the arrow on the galvanometer as a result of this motion.[2 marks]
  5. 1(c)(ii)Explain why an induced current is produced.[2 marks]
  6. 1(c)(iv)Show on Figure 2 the direction of the induced current as a result of this motion.[1 mark]
  7. 1(c)(v)State THREE changes or adjustments that Kevin could make in this experiment to increase the induced e.m.f.[3 marks]
  8. 1(c)(vi)Describe what will happen if the magnet remains stationary in the coil.[1 mark]
  9. 1(d)(i)Draw on Figure 3 the direction of the induced current if the coil rotates in a clockwise direction.[1 mark]
  10. 1(d)(ii)If the period of rotation of the coil is 0.02 s, calculate its frequency.[2 marks]
  11. 1(d)(iii)If the speed and direction of rotation of the coil are constant, sketch a graph of voltage (V) against time (s) to show the output for the generator for one…[2 marks]

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