A charge flows through a $200\mathrm{ \Omega }$ galvanometer connected to a $400\mathrm{ \Omega }$ circular coil of $1000$ turns wound on a wooden stick $\mathrm{20\; mm}$ in diameter. If a magnetic field $\text{B}=0.012\text{T}$ parallel to the axis of the stick is decreased suddenly to zero, the charge is

• Correct answer
  A

  $6.3 \mathrm{\mu C}$
• B

  $\mathrm{63 }\mathrm{\mu C}$
• C

  $\mathrm{0.63 }\mathrm{\mu C}$
• D

  $\mathrm{630 }\mathrm{\mu C}$

Hence, the correct answer is option: 'A'.