Physics · 2019
JEE Main · 9 April 2019, Shift 2 · Q20
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…
A moving coil galvanometer has a coil with $\displaystyle 175$ turns and area $\displaystyle 1 \mathrm{~cm}^2$. It uses a torsion band of torsion constant $\displaystyle 10^{-6} \mathrm{~N}-\mathrm{m} / \mathrm{rad}$. The coil is placed in a magnetic field $\displaystyle B$ parallel to its plane. The coil deflects by $\displaystyle 1$° for a current of $\displaystyle 1$ mA . The value of B (in Tesla) is approximately :
Official answer
(2)
$\displaystyle 10^{-3}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.