Q6 of 27 Page 498

Core of an electromagnet must be of soft iron but not steel. Justify it.

The soft iron inside the coil makes the magnetic field

Stronger because it becomes a magnet itself when the current is flowing. That is, Soft iron is said to form a temporary magnet. In this way, the electromagnet can be switched on and off by turning the electricity on and off.


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4

Suppose a coil is place in a changing magnetic field and the circuit is not closed will the current induce in the coil?

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What happens to the force experienced by a current carrying conductor placed in a uniform magnetic field, when placed

(a) parallel to magnetic field?


(b) perpendicular to magnetic field?

 8

With the help of neat diagram describe how you can generate induced current in the circuit.