Question

A strong magnetic field is applied on a stationary electron. Then the electron

• A. moves in the direction of the field
• B. remains stationary
• C. moves perpendicular to the direction of the field
• D. moves opposite to the direction of the field

Answer 1

Answer: (B)

As $\vec{F}=\vec{q}(\vec{v}\times \vec{B})$
As the electron is stationary, $\therefore$ velocity $\vec{v}=0$.
$\therefore \vec{F}=0.$ So, electron will remain stationary.