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A metre rule is suspended by a thread such that it in equilibrium balanced by a permanent magnet attached to the metre rule and some weight as shown in the figure below.

If the soft iron is fixed to the bench, state and explain the effect on the metre rule when the switch is close.

Answer Text:
The metre rule will tilt to the anticlockwise direction,this iks because the soft core will acquire a south pole which will attract the north pole of the magnet on the metre rule