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In the set up below, the suspended metre rule is in equilibrium balanced by the magnet and the weight shown. The iron core is fixed to the bench:
PhycF4T1P2Q18b

  1. State and explain the effect on the metre rule when the switch S, is closed.
  2. What would be the effect of reversing the battery terminals? 

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  1. The magnet will be attracted  towards the soft iron core.
    The end of the coil facing the magnet becomes South Pole when switch is closed; and the rule turns anticlockwise 
  2. The polarities of the electro-magnet becomes reversed therefore the magnet is now repelled away from iron core ; and the rule turns clockwise
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