Question

Assertion: Electron moving perpendicular to $\vec{B}$ will perform circular motion
Reason: Force by magnetic field is perpendicular to velocity

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

If $\vec{F} \bot \vec{V} $ at all instants then motion will be circular