The magnetic field in a travelling electromagnetic wave has a peak value of 30 nT. The peak value of electric field strength is: (speed of light in free space is $3 \times 10^8 m/s$).

9.0 V/m 3.0 V/m 6.0 V/m 18.0 V/m

9.0 V/m

The correct answer is Option (1) → 9.0 V/m