Physics JAMB

A moving coil galvanometer has a full-scale deflection of 3A equivalent to 30° deflection. The sensitivity of the instrument is?

A. 33.0
B. 0.1
C. 90.0
D. 10.0

Correct Answer:

Option D = 10.0

Explanation

Sensitivity of a measuring instrument is given by deflection per unit current: and given that deflection = 30o; and current (I) = 3A: then the sensitivity of the meter = 30/3 = 10.0

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