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Physics

Fill in the blanks:
(a) A magnet has …………… poles.
(b) Like poles …………… each other and unlike poles …………… .
(c) An electromagnet is used to separate large mass of …………… scrap.
(d) The strength of magnetic field of an electromagnet is increased by inserting a core of …………… .
(e) In a torch, we use …………… as the source of electricity.
(f) To light a table lamp and to run a refrigerator, we use …………… as the source of electricity.
(g) A group of two or more cells is called a …………… .
(h) …………… pass electricity through them.
(i) …………… do not pass electricity through them.

Electro-Magnetism

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Answer

(a) Two

(b) repel, attract

(c) iron

(d) soft iron

(e) dry cell

(f) mains

(g) battery

(h) Conductors

(i) Insulators

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Write true or false for each statement:
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(b) A coil carrying current behaves like a magnet.
(c) In an electromagnet, the core is made up of copper.
(d) An electric bell uses an electromagnet.
(e) An electromagnet with soft iron core is a temporary magnet.
(f) We use cell as the source of electricity to run an electric immersion rod.
(g) A torch bulb glows if the terminals of the bulb are connected to the terminals of a cell by the metallic wire.
(h) Wool is a conductor of electricity.
(i) Silver is an insulator of electricity.
(j) Our body is a conductor of electricity.
(k) For a circuit to be complete, every part of it must be made up of conductors.
(l) All metals are conductors of electricity.
(m) The switch should not be touched with wet hands.
(n) A switch is an on-off device in an electric circuit.
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