Q7 of 39 Page 240

List three sources of magnetic fields.

The Magnetic fields can be produced:

a) By using a permanent magnet.


b) By passing electric current through circular coil.


c) By using an electromagnet.


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5

At the time of short circuit, the current in the circuit:

 6

State whether the following statements are true or false:

(a) An electric motor converts mechanical energy into electrical energy.


(b) An electric generator works on the principle of electromagnetic induction


(c) The field at the centre of a long circular coil carrying current will be parallel straight lines


(d) A wire with a green insulation is usually the live wire of an electric supply

 8

How does a solenoid behave like a magnet? Can you determine the north and south poles of a current carrying solenoid with the help of a bar magnet? Explain.

 9

When is the force experienced by a current-carrying conductor placed in a magnetic field largest ?