question_answer

The resistance of a galvanometer is 50 ohm and the maximum current which can be passed through it is 0.002 A. What resistance must be connected to it in order to convert it into an ammeter of range 0 - 0.5 A? [JEE Main 9-4-2019 Afternoon]

A) 0.2 ohm

B) 0.002 ohm

C) 0.02 ohm                    

D) 0.5 ohm

Correct Answer: A

Solution :

\[S\left( 0.50.002 \right)=50\times 0.002\] \[S=\frac{50\times 0.002}{(0.5-0.002)}=\frac{0.1}{0.498}=0.2\]