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JEE Main202126 Aug 2021Evening ShiftPhysicsElectromagnetic WavesActual

A light beam is described by E = 800 sin ω t - x c . An electron is allowed to move normal to the propagation of light beam with a speed of 3 × 10 7 m s - 1 . What is the maximum magnetic force exerted on the electron?

Options

  1. A1 . 28 × 10 - 21   N
  2. B12 . 8 × 10 - 18   N
  3. C1 . 28 × 10 - 18   N
  4. D12 . 8 × 10 - 17   N

Correct answer

B. 12 . 8 × 10 - 18   N

Step-by-step solution

E 0 = 800   V B 0 = E 0 c = 800 3 × 10 8 F m = q v B 0 = 1 . 6 × 10 - 19 × 3 × 10 7 × 800 3 × 10 8 = 12 . 8 × 10 - 18   N

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