GALVANOMETER

Question 1

1. What is galvanometer?

Answer 1

IT is a device used to identify the presence of feeble current.

Question 2

2. What is the aim of this experiment?

Answer 2

We have to find the resistance of galvanometer ( G) and
another constant of galvanometer called Figure of Merit (K)

Question 3

3. What is the purpose of finding the value K?

Answer 3

By knowing the value of K, we can convert that
galvanometer into Ammeter and Voltmeter of desired ranges.

Question 4

4. Name the method under which this experiment works?

Answer 4

Half deflection method.

Question 5

5. Define Figure of merit?

Answer 5

The quantity of current required to produce a deflection of 1 division in the
galvanometer is called Figure of merit.

Question 6

6. Why the scale of galvanometer has zero in the middle?

Answer 6

A needle at zero in the middle can deflect
on both sides.

Question 7

7. Define current sensitivity, voltage sensitivity.

Answer 7

Current sensitivity- Its the amount of deflection produced when unit current passes through the rectangular coil.
Is=NBA/K
Voltage sensitivity-Its the amount of deflection produced when unit potential difference is applied across the terminals.
Vs=NBA/KR

Question 8

8. How to convert galvanometer into ammeter and
   voltmeter.

Answer 8

When a galvanometer is connected in parallel with a small resistance, the whole arrangement is known as ammeter.
when a galvanometer is connected in series with a high resistance, the whole arrangement is known as voltmeter.

Question 9

9. Define ideal ammeter, ideal voltmeter?

Answer 9

For an ideal ammeter, net resistance (X=GS/G+S) , X=0.
For an ideal voltmeter, net resistance (X=G+R),X=∞

Question 10

10. Why galvanometer is called a moving coil galvanometer?

Answer 10

Because in it, a coil deflects on both sides
due to torque.

Question 11

11. Why this method is called half deflection method?

Answer 11

It is so because the deflection is made half by
using a shunt resistance S

Question 12

12. How the low resistance in parallel (shunt resistance) gives the required properties to a
    galvanometer?

Answer 12

By adding shunt resistance to galvanometer, the overall resistance of ammeter
becomes very less and increases its current carrying capacity.

Question 13

13. What is the full name of ammeter?

Answer 13

Ampere Meter

Question 14

14. Is the working of MCG affected by the earth’s magnetic field?

Answer 14

No, Earth’s magnetic field is very
weak as compared to the magnets in MCG.