Answer:
Explanation:
velocity of electron V = 4 x 10³ m/s
magnetic field B = 1.25 T .
magnetic force = 1.4 x 10⁻¹⁶ N.
If direction of velocity makes angle θ with magnetic field
magnetic force = magnetic field x charge on electron x velocity x sinθ
1.4 x 10⁻¹⁶ = 1.25 x 1.6 x 10⁻¹⁹ x 4 x 10³ x sinθ
1.4 x 10⁻¹⁶ = 8 x 10⁻¹⁶ x sinθ
sinθ = 1.4 / 8
= .175
θ = 10 degree
or 180 - 10
= 170 degree
because
sinθ = sin (180 - θ)
