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Question

The diagram in the figure shows a coil wound around a soft iron bar XY.

(a) State the polarity at the ends X and Y as the switch is pressed.

(b) Suggest one way of increasing the strength of electromagnet so formed. 


 


Solution

(a) X - North pole, Y – South pole

(b) The strength of the electromagnet can be increased by reducing resistance of the circuit by means of the rheostat, thus increasing the current.

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