question_answer

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 V, the resistance in Ohm's needed to be connected in series with the coil will be [AIEEE 2005]

A) \[{{10}^{3}}\]

B) \[{{10}^{5}}\]

C) 99995

D) 9995

Correct Answer: D

Solution :

[d] Full scale deflection current

Full scale deflection voltage

Galvanometer resistance,

Required full scale deflection voltage,

Let resistance to be connected in series be R.

\[V={{l}_{g}}(R+G)\]