Will the compass needle show deflection when the switch in the circuit shown in Fig. 14.69 is closed?

Name any two effects of electric current.

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

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 _________.

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 electro-magnet. (T/F)