What is the force experienced by an electron moving with velocity of 0.5c in a magnetic field $\vec{B}$ of 2T? The angle between the velocity vector and $\vec{B}$ is 90°.
(c is the velocity of light, $e=1.6 \times 10^{-19} C$)
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → $4.8 \times 10^{-11} N$
Since the angle between the velocity vector and magnetic field is 90°, the force is at its maximum.
$F=|q|vB$ [Lorentz force]
$=(1.6×10^{-19})×(1.5×10^8)×2$
$=4.8×10^{-11}N$