JEE PYQ: Magnetic Effects Of Current Question 36
Question 36 - 2019 (09 Apr 2019 Shift 2)
A moving coil galvanometer has a coil with $175$ turns and area $1$ cm$^2$. It uses a torsion band of torsion constant $10^{-6}$ N-m/rad. The coil is placed in a magnetic field $B$ parallel to its plane. The coil deflects by $1°$ for a current of $1$ mA. The value of $B$ (in Tesla) is approximately:
(1) $10^{-4}$
(2) $10^{-2}$
(3) $10^{-1}$
(4) $10^{-3}$
Show Answer
Answer: (3) $10^{-1}$
Solution
$C\theta = NBIA$. $B \approx 10^{-1}$ T.
BETA
