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4 marksPermanent Magnets

CSEC Physics · May/June 2009 · Paper 2 · Question 5(a)

Magnets are characterized by magnetic field lines.

Sketch the magnetic field associated with (i) a single bar magnet and (ii) between two strong bar magnets with their north poles facing, and in line with, each other.

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Other parts of this question

  1. 5(b)(i)How is the electromotive force (e.m.f.) generated in the stationary coil?[5 marks]
  2. 5(b)(ii)What ADDITIONAL component is needed to be able to charge the batteries?[5 marks]
  3. 5(b)(iii)At a reasonable cranking rate, the unit generates 6.2 V. Calculate the current in the circuit if the resistance is 310 Ω.[5 marks]
  4. 5(c)(i)How many turns are needed in the secondary winding if the voltage is stepped up from 6.2 V to 15.5 V?[6 marks]
  5. 5(c)(ii)Given that the current in the primary winding is 10 mA, what power is transmitted to the secondary windings if the transformer is 77% efficient?[6 marks]

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