JEE PYQ: Magnetism And Matter Question 10
Question 10 - 2020 (08 Jan 2020 Shift 2)
A galvanometer having a coil resistance $100,\Omega$ gives a full scale deflection when a current of $1$ mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of $10$ V?
(1) $10$ k$\Omega$
(2) $8.9$ k$\Omega$
(3) $7.9$ k$\Omega$
(4) $9.9$ k$\Omega$
Show Answer
Answer: (4) $9.9$ k$\Omega$
Solution
$V = i_g(G + R)$, so $10 = 1 \times 10^{-3}(100 + R_0)$, giving $R_0 = 9900,\Omega = 9.9$ k$\Omega$.
BETA
