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A bar magnet is moved into a coil of insulated copper wire connected to a centre-zero galvanometer, as shown in the figure below.
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  1. Show on the diagram the direction of induced current in the coil.
  2. State and explain clearly what is observed on the galvanometer when the S-pole of the magnet is moved into and then withdrawn from the coil.

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  1. SekphycP2A15iiI
  2.    
    • S-Pole of magnet moved into the coil.
      -Galvanometer deflects to the left (on one side) momentarily. -Induced current in the coil flows so as to form a South Pole at the  end of the coil near the magnet.
    • S-Pole of magnet withdrawn.
      -Changing the direction of motion  reverses the direction of induced  current so that the end of the coil tends to form a N-Pole so as to oppose the motion of the magnet out of the coil.--Galvanometer reverses its direction of deflection/deflects to the right  momentarily.
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