Unit 2 Subtopic 2.2

What is the principle of Moving Coil Galvanometer.

• Current carrying coil in an electric field experiences a force

• Current carrying coil in magnetic field experiences no force

• Current carrying conductor in magnetic field experiences a force

• Current carrying conductor in an electric field produces no force

What is the galvanometer used to measure?

• measure the wind

• pressure gauge

• measure current

• measure water flow

Which of the following is not a component of the galvanometer?

• Pointer

• Magnetic bar

• Resistor

• Hair spring

Reorder the following operation of PMMC :

1. 1.It creates electromagnetic field WHICH it has poles (north and south).

2.These poles will react with the permanent magnet poles

3.Since opposite poles attract, the coil will move to the position desired

4.The amount of force experienced by the coil is proportional to the current passing through the coil.

5.When the switch is closed, current flows to the moving coil of PMMC

• 1,3,2,4,5

• 5,1,2,3,4

• 5,2,1,3,4

Which one is the Moving Coil ?

• i

• ii

• iii

• iv

Which one is the Hair Spring ?

• i

• ii

• iii

• iv

Which one is the soft iron core ?

• i

• ii

• iii

• iv

Problem : To return the coil to its original position when there is no current through the coil.

What accessories used to solve the problem above ?

• Iron core

• Hairspring

• Needle

• Scale