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3 marksMotors

CSEC Physics · 1997 · Paper 2 · Question 1(c)(i)

Figure 3 shows a coil of wire mounted on an axle and placed between the poles of a permanent magnet.

Explain why the coil begins to rotate when a current is passed through it.

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Other parts of this question

  1. 1(a)Indicate, with a short arrow, labelled F, the direction of the force exerted on the negatively charged object, and draw the electric field in the region of the…[3 marks]
  2. 1(b)(i)On Figure 2, indicate with an arrow the direction of the force exerted by the magnetic field on this conductor.[1 mark]
  3. 1(b)(ii)How could the force on this conductor be increased?[2 marks]
  4. 1(b)(iii)Draw a labelled diagram to show how you could produce a uniform magnetic field like the one on page 2.[2 marks]
  5. 1(c)(ii)What extra device is needed to ensure that the coil continues to rotate?[1 mark]
  6. 1(d)(i)Draw the magnetic field near to the conductor, using arrows to indicate the direction of the field.[2 marks]
  7. 1(d)(ii)Another wire, parallel to the first, carrying current in the SAME direction, is positioned at Point P. On Figure 4, show the direction of the force on this…[2 marks]

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