AP EAMCET20224 Jul 2022Morning ShiftPhysicsElectromagnetic WavesActual
A plane electromagnetic wave travels in free space along z - axis. At a particular point in space, the electric field along x -axis is 8 . 7 V m - 1 . The magnetic field along y - axis is
Options
- A2 . 9 × 10 - 8   T
- B3 × 10 - 6   T
- C8 . 7 × 10 - 6   T
- D3 × 10 - 5   T
Correct answer
A. 2 . 9 × 10 - 8   T
Step-by-step solution
We know that the ratio of the magnitudes of electric and magnetic fields equals the speed of light in free space i.e., c = E 0 B 0 . And in an electromagnetic wave, the electric field and magnetic field are perpendicular to one another. So, using the relation, the magnetic field along y ‐ axis is B 0 = E 0 c = 8 . 7 3 × 10 8 = 2 . 9 × 10 - 8   T