Question

Q. Which of the following appliances does not use an electromagnet?
A) Electric bell
B) Washing Machine
C) Refridgerator
D) Electric heater

Answer 1

Answer:

D) electric heater.

Answer 2

The appliance that does not use an electromagnet is (D) an Electric heater.

• Electric bell, washing machine and refrigerator use an electromagnet while the electric heater is based on the heating effect of current.
• The electric heater produces heat due to the heating effect of the iron coil.
• The resistance of the coil increases the heat produced as the electric current is passed through the conductor as per the formula: H = i²rt.

Here, r is the resistance, i is the

the current passed and t is the time

for which the current is passed.

• An electromagnet produces a magnetic field around a wire on the application of electric current and it works as if a permanent magnet.