JEE Main202116 Mar 2021Morning ShiftPhysicsElectromagnetic WavesActual
A plane electromagnetic wave of frequency 500 MHz is traveling in a vacuum along the y - direction. At a particular point in space and time, B → = 8 . 0 × 10 - 8 z ^ T . The value of the electric field at this point is:(speed of light = 3 × 10 8 ms - 1 ) x ^ , y ^ , z ^ are unit vectors along x , y and z direction.
Options
- A- 24 x ^   V   m - 1
- B2 . 6 x ^     V   m - 1
- C24 x ^     V   m - 1
- D- 2 . 6 x ^     V   m - 1
Correct answer
A. - 24 x ^   V   m - 1
Step-by-step solution
f = 5 × 10 8   Hz EM wave is travelling towards + j ^ B → = 8 . 0 × 10 - 8 z ^   T E → = B → × C → = 8 × 10 - 8 z ^ × 3 × 10 8 y ^ = - 24 x ^     V   m - 1