Practice portal › Electromagnetic Waves › E and B in the Wave

A plane electromagnetic wave travels in free space along the x-direction. The electric field component of the wave at a particular point of space and time is E = 6 V m⁻¹ along y-direction. Its corresponding magnetic field component, B would be

Asked in JEE Main 8th April 1st Shift 2019 · Writing B from E, and E from B

• (1) 6 × 10⁻⁸ T along x-direction
• (2) 2 × 10⁻⁸ T along y-direction
• (3) 2 × 10⁻⁸ T along z-direction
• (4) 6 × 10⁻⁸ T along z-direction

Step-by-step solution

Why the other options are wrong

• (1) 6 × 10⁻⁸ keeps the 6 without dividing by 3, and x is the propagation direction
• (2) comes from magnitude right, but y is E's own direction
• (4) comes from direction z is right, but 6/(3 × 10⁸) = 2 × 10⁻⁸ T, not 6 × 10⁻⁸ T

Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.