PHYSICS

JAMB 2004 - Question 20

Physics 2004 JAMB Past Questions - Question 20: a moving coil galvanometer has a full scale deflection of 3 A equivalent to 30 deflection .the sensitivity of the instrument is

Choose the correct answers from the options given.
a moving coil galvanometer has a full scale deflection of 3 A equivalent to 30 deflection .the sensitivity of the instrument is
A:
B:
C:
D:
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Correct Answer

B

Explanation

The sensitivity of a moving coil galvanometer is typically defined as the current required to produce a full-scale deflection. In this case, you have a moving coil galvanometer with a full scale deflection of 3 A, which is equivalent to 30 divisions on the scale.

To find the sensitivity, you can use the formula:

Sensitivity (S) = Full Scale Current (I) / Full Scale Deflection (N)

Where:
- Sensitivity (S) is what we want to find.
- Full Scale Current (I) is 3 A in this case.
- Full Scale Deflection (N) is 30 divisions.

So, plug in the values:

Sensitivity (S) = 3 A / 30 = 0.1 A/division

The sensitivity of the instrument is 0.1 A per division. This means that each division on the galvanometer's scale corresponds to a change of 0.1 A in the current being measured.