An infinitely long straight conductor carries a current of $5\mathrm{A}$ as shown. An electron is moving with a speed of ${10}^5 \mathrm{m} {\mathrm{s}}^{-1}$ parallel to the conductor. The perpendicular distance between the electron and the conductor is $20 \mathrm{cm}$ at an instant. Calculate the magnitude of the force experienced by the electron at that instant.

• A

  $4\times {10}^{-20} \mathrm{N}$
• B

  $8\pi \times {10}^{-20} \mathrm{N}$
• C

  $4\pi \times {10}^{-20} \mathrm{N}$
• Correct answer
  D

  $8\times {10}^{-20} \mathrm{N}$

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