A horizontal telegraph wire of length 30 m spread east to west fell down freely from a height of 20 m. If the resistance of the wire is $40 \Omega$ and the horizontal component of the earth's magnetic field at the place is $2 \times 10^{-5} \mathrm{~T}$, then the induced current when the wire reaches the ground is (Acceleration due to gravity $=10 \mathrm{~m} \mathrm{~s}^{-2}$ )

• Correct answer
  A

  0.3 mA
• B

  3 mA
• C

  3 A
• D

  0.03 A

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