Question

where permanent magnet is used ? options a. Relays , b. Ignition coil, c. Solenoids,d. Moving coil instruments,

Answer 1

Permanent magnets 're used in moving cool instruments.

Hope it helps....

Answer 2

‘Permanent magnet’ is used in moving coil instruments.

Option: (d)

Explanation:  

• Permanent magnets are such magnets where the ‘magnetic field’ is not change when the current is changed.  

• Permanent magnets have lesser use as compared to ‘electromagnets’. Moving coil instruments as galvanometers use permanent magnets such as ‘bar magnet and horseshoe magnet’.  

• This is because in these type of instrument the magnet there is a ‘constant magnetic field’ all throughout the experiment.  

• Ignition coil and solenoids use electromagnets so that the ‘magnetic field’ is changed as per requirement.