question_answer

A galvanometer having a coil resistance of \[100\Omega \] gives a full scale deflection, when a current of 1 mA is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of 10A, is :- [JEE Main Solved Paper-2016 ]

A) \[3\Omega \]                                    

B) \[0.01\Omega \]

C) \[2\Omega \]                                    

D) \[0.1\Omega \]

Correct Answer: B

Solution :

                P.D. should remain same \[\text{1mA}\times \text{1}00=\text{9}.\text{999R}\] \[R=\frac{1}{99.99}=0.01R\]