$A$ moving coil galvanometer has a rectangular wire coil of enclosed area $0.001 \ m^2$ and $500$ turns. The coil operates in a radial magnetic field of $0.2 \ T$ and carries a current of $6 \pi \times 10^{-8} \ A$. If the torsional spring constant is $6 \times 10^{-7} \ N-m/rad$, then the angular deflection of the coil in radians is

  • A
    $\frac{\pi}{100}$
  • B
    $\frac{\pi}{200}$
  • C
    $\frac{\pi}{300}$
  • D
    $\frac{\pi}{400}$

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