JEE PYQ: Magnetic Effects Of Current Question 49
Question 49 - 2019 (12 Jan 2019 Shift 1)
A galvanometer, whose resistance is $50$ ohm, has $25$ divisions in it. When a current of $4 \times 10^{-4}$ A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range $2.5$ V, it should be connected to a resistance of:
(1) $250$ ohm
(2) $200$ ohm
(3) $6200$ ohm
(4) $6250$ ohm
Show Answer
Answer: (2) $200$ ohm
Solution
$I_g = 25 \times 4 \times 10^{-4} = 10^{-2}$ A. $2.5 = 10^{-2}(50 + R)$, $R = 200$ $\Omega$.
BETA
