JAMB 1980
A milliameter of resistance 5Ω and full scale deflection of 5mA is to used to measure a potential difference of 50 V. The resistance of the multiplier should be
A. 95Ω
B. 110Ω
C. 595Ω
D. 995Ω
E. 1005Ω
Correct Answer: Option D
Explanation
V = IR
50 = 50 x 10^-3 (5 + R)
R = 995Ω
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