$A$ current of $200 \ \mu A$ deflects the coil of a moving coil galvanometer through $60^{\circ}$. The current required to cause a deflection of $\frac{\pi}{10}$ radians is: (in $\mu A$)

  • A
    $30$
  • B
    $120$
  • C
    $60$
  • D
    $180$

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Explain the construction and principle of a moving coil galvanometer.

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