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2 marksAlternating Current

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

Figure 3 shows a simple layout of an a.c. generator. A coil PQRS is connected to other components of the circuit which allow the coil to rotate in the direction indicated by the arrow.

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 complete cycle, given that it starts rotating from its current position.

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Other parts of this question

  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)(iii)Why is it necessary to use a sensitive galvanometer?[1 mark]
  7. 1(c)(iv)Show on Figure 2 the direction of the induced current as a result of this motion.[1 mark]
  8. 1(c)(v)State THREE changes or adjustments that Kevin could make in this experiment to increase the induced e.m.f.[3 marks]
  9. 1(c)(vi)Describe what will happen if the magnet remains stationary in the coil.[1 mark]
  10. 1(d)(i)Draw on Figure 3 the direction of the induced current if the coil rotates in a clockwise direction.[1 mark]
  11. 1(d)(ii)If the period of rotation of the coil is 0.02 s, calculate its frequency.[2 marks]

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