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 -A. 99995B. 9995C. `10^(3)`D. `10^(5)`

A moving coil galvanometer has 150 equal divisions. Its current sensit

1.	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 -A. 99995B. 9995C. `10^(3)`D. `10^(5)`
Answer» Correct Answer - B (b) `I_(max) = (150)/(10) = 15 mA, V_(max) = (150)/(2) = 75 mV` resistance of galvanometer: `G = (V_(max))/(I_(max)) = (75)/(15) = 5 Omega` Now range of voltmeter `= 150 xx 1 = 150 V` `150 = (5 + R) I_(max) implies R = 9995 Omega`

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