Question

Magnets are used in _________ .

• A. Mixer and grinder
• B. Televisions
• C. Doorbells
• D. Both (B) and (C)

Answer 1

The correct option is D

Both (B) and (C)

Explanation for the correct options

D: Both (B) and (c)

B: Television

1. The coloured picture that we see on television is due to the interaction of electrons and the magnetic field inside the picture tube.
2. Electrons are produced by the cathode tube and the magnetic field is produced by the magnet fitted inside the picture tube.
3. The sound of the television is due to the speakers which consist of a permanent magnet.

C: Doorbells

1. An electric doorbell is a simple device with an electromagnet as its major component.
2. When current flows through the coil of the electromagnet inside the bell, the electromagnet starts behaving like a magnet and attracts the armature.
3. When the armature moves towards the electromagnet, the hammer connected to it hits the gong and produces the sound.

Explanation for the incorrect option

A: Mixer and grinder

1. In the case of a mixer grinder, an electric motor is used.
2. When current flows through the motor, it converts electric energy into mechanical energy which rotates the blades of the mixer grinder.

Hence, option (D) is correct.