A light beam travelling in the x-direction is described by the eletric field E y = (300 V/m) sin ω (t – x/c). An electron is constrained to move along the y-direction with a speed of 2.0 × 10 7 m/s. The maximum electric force and the maximum magnetic force on the electron are-
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The maximum electric field is E 0 = 300 V/m. The maximum magnetic field is along the z-direction.
B 0 = 
= 
= 10 –6 T
The maximum electric force on the electron is
F e = qE 0 = (1.6 × 10 –19 C) × (300 V/m) = 4.8 × 10 –17 N.
The maximum magnetic force on the electron is
F b = 
= qvB 0
= (1.6 × 10 –19 C) × (2.0 × 10 7 m/s) × (10 –6 T) = 3.2 × 10 –18 N.
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