10(a)
The diagram shows a coil wound around a U shape soft iron bar AB.
(i) What is the polarity induced at the ends A and B when the switch is pressed?
(ii) Suggest one way to strengthen the magnetic field in the electromagnet.
(iii) What will be the polarities at A & B if the direction of current is reversed in the circuit?
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(i) The polarity induced at the end A is North and at the end B is South.
(ii) To strengthen the magnetic field in the electromagnet, the current flowing in it is increased.
(iii) On reversing the direction of current, the end A will be south pole and the end B will be the north pole.