A positive charge is moving vertically upwards. When it enters a region of magnetic field directed towards north, the direction of force on the charge would be
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → West
Force on a moving charge in a magnetic field: $\vec{F} = q \vec{v} \times \vec{B}$
Given: $q > 0$, $\vec{v}$ vertically upward, $\vec{B}$ towards north.
Use right-hand rule:
- Fingers point along $\vec{v}$ (upwards),
- Curl towards $\vec{B}$ (north),
- Thumb gives direction of force $\vec{F}$.
Direction of force = west