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Chapter 14 Electric Current and Its Effects Solutions

Question - 1 : -
Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position and battery.

Answer - 1 : -

Question - 2 : -
Draw the circuit diagram to represent the circuit shown in Fig.

Answer - 2 : -

Question - 3 : -
Figure shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.

Answer - 3 : -

Question - 4 : -
The bulb in the circuit shown in Fig. does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

Answer - 4 : -

The problem in this circuit is the connection of two cells. Here both the positive terminals of the cells are connected to each other. This must be reversed for any one cell to make the bulb glow i.e., positive terminal of one cell should be connected with the negative terminal of the other.

Question - 5 : -
Name any two effects of electric current.

Answer - 5 : -

(i) Heating effect.
(ii) Magnetic effect.

Question - 6 : -
When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Answer - 6 : -

We know that the needle of a compass is itself a tiny magnet, which points in north-south direction. When we bring a magnet close to it, the needle gets deflected. When electric current passes through a wire it also behaves like a magnet. And hence the needle of the compass will also be deflected.

Question - 7 : -
Will the compass needle show deflection when the switch in the circuit shown by Fig. is closed?

Answer - 7 : -

No. Because there is no cell/battery in the circuit and hence no current will flow through the wires.

Question - 8 : -
Fill in the blanks:
(a) Longer line in the symbol for a cell represents its …….. terminal.
(b) The combination of two or more cells is called a ……… .
(c) When current is switched ‘on’ in a room heater, it …….. .
(d) The safety device based on the heating effect of electric current is called a ….. .

Answer - 8 : -

(a) positive battery
(b) battery
(c) becomes red hot
(d) fuse

Question - 9 : -
Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)
(b) When the electric current, through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)
(c) An electromagnet does not attract a piece of iron. (T/F)
(d) An electric bell has an electromagnet. (T/F)

Answer - 9 : -

(a) False
(b) True
(c) False
(d) True

Question - 10 : -
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Answer - 10 : -

No. An electromagnet develops magnetic property and it will attract only the magnetic substances. Since the plastic bags are non-magnetic so they cannot be separated from a garbage heap by an electromagnet.

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