An electron moves in a circular arc of radius 10 $\mathrm{m}$ at a contant speed of $2 \times 10^{7} \mathrm{~ms}^{-1}$ with its plane of motion normal to magnetic flux density of $10^{-5} \mathrm{~T}$. What will be the value of specific charge of the electron?

• A

  $2 \times 10^{4} \mathrm{Ckg}^{-1}$
• B

  $2 \times 10^{5} \mathrm{Ckg}^{-1}$
• C

  $5 \times 10^{6} \mathrm{Ckg}^{-1}$
• Correct answer
  D

  $2 \times 10^{11} \mathrm{Ckg}^{-1}$

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