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 - I 3-4-2016]

A) \[3\Omega \]

B) \[0.01\Omega \]

C) \[2\Omega \]

D) \[0.1\Omega \]

Correct Answer: B

Solution :

[b]

P.D. should remain same

\[\text{1mA}\times \text{1}00=\text{9}.\text{999R}\]

\[R=\frac{1}{99.99}=0.01R\]