Fig. 10.18 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.

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Solution

a)

b)By increasing the number of turns of winding in the solenoid, the strength of the electromagnet can be increased.

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Fig. 10.18 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.

a) b)By increasing the number of turns of winding in the solenoid, the strength of the electromagnet can be increased.

a)

b)By increasing the number of turns of winding in the solenoid, the strength of the electromagnet can be increased.