question_answer

A galvanometer having a resistance of \[20\,\Omega \]and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is- [JEE Main 11-Jan-2019 Evening]

A) \[80\,\Omega \]

B) \[125\,\Omega \]

C) \[120\,\Omega \]

D) \[100\,\Omega \]

Correct Answer: A

Solution :

[a]

To read 15 V