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Moving Charges And Magnetism

Question
CBSEENPH12039684
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A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be

  • 103

  • 105

  • 99995

  • 9995

Solution

D.

9995

straight I subscript straight g space equals space 15 space mA straight V subscript straight g space equals space 75 space mV straight R space equals space straight V over straight I subscript straight g minus straight V subscript straight g over straight I subscript straight g

Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M1 and M2 have the following particulars:
R1 = 10 Ω   N1 = 30,
A1 = 3.6 x 10–3 m2,  B1 = 0.25 T
R2 = 14 Ω;  N2 = 42,
A2 = 1.8 x 10–3 m2, B2 = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.

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