A plane electromagnetic wave of frequency 25 MHz travels in free space along x – direction. At a particular point in space and time, electric field E = 6.3 Vm-1. The magnitude of magnetic field B at this point is:

1.2 × 10-6 T 1.2 × 10-8 T 2.1 × 10-6 T 2.1 × 10-8 T

2.1 × 10-8 T

As, B = $\frac{E}{c}=\frac{6.3}{3 \times 10^8}$ = 2.1 × 10-8 T