JEE Main201910 Jan 2019Morning ShiftPhysicsElectromagnetic WavesActual
If the magnetic field of a plane electromagnetic wave is given by (The speed of light = 3 × 10 8 m / s ) B = 100 × 10 - 6 sin ⁡ 2 π × 2 × 10 15 t - x c then the maximum electric field associated with it is:
Options
- A3 × 10 4   N   C - 1
- B4 × 10 4   N   C - 1
- C4.5 × 10 4   N   C - 1
- D6 × 10 4   N   C - 1
Correct answer
A. 3 × 10 4   N   C - 1
Step-by-step solution
We know that relation between electric field E and magnetic field B is given by: E B = c ⇒ E = B c = 100 × 10 - 6 × 3 × 10 8   V   m - 1 = 3 × 10 4   V   m - 1