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2 marksMotors

CSEC Physics · 2021 · Paper 2 · Question 5(a)(iv)

A simple d.c. motor consisting of a coil of wire ABCD between magnet poles.

Explain why a split-ring (commutator) is used in a d.c. motor.

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Other parts of this question

  1. 5(a)(i)Draw the magnetic field between the poles of the magnet on Figure 6.[2 marks]
  2. 5(a)(ii)State the direction in which side DA of the coil will move as the current starts flowing through the circuit.[1 mark]
  3. 5(a)(iii)Name the rule used to determine the direction in which side DA of the coil moves.[1 mark]
  4. 5(b)(i)Calculate the value of the frequency for the generator.[3 marks]
  5. 5(b)(ii)The peak voltage is applied by the generator across a 100.0 Ω resistor. Calculate the peak value of the current in the resistor.[3 marks]
  6. 5(c)(i)State the effect this will have on the period of the output.[2 marks]
  7. 5(c)(ii)State the effect this will have on the value of the output voltage.[1 mark]

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