JEE Main 2026 Physics question
An electromagnetic wave travelling in x-direction is described by field equation . If the electron is restricted to move in y-direction only with speed of 1.5 × 10⁶ m/s then ratio of maximum electric and magnetic forces acting on the electron is .
Answer: (A)
Solution
,max = eE₀ and ,max = e v B₀ = e v E₀/c, so the ratio is c/v = 3 × 10⁸/(1.5 × 10⁶) = 200.