Equation for light beam is given as E=800‌sin(ωt−
x
C
) Here, c is speed of light. Comparing with standard equation, we get E0=800Vm−1 As we know, the magnitude of magnetic field is given as E0=B0C ⇒800=B0×3×108 ⇒B0=
800
3×108
T Maximum magnetic force exerted on electron will be Fmax=ev‌B0 =(1.6×10−19)×(3×107)×
800
3×108
(Given, v=3×107ms−1 ) Fmax=12.8×10−18‌N or 1.28×10−17