Question

A proton and an electron both moving with the same velocity v enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that

• A. Their time periods will be same
• B. The time period for proton will be higher
• C. The time period for electron will be higher
• D. Their orbital radii will be same

Answer 1

Answer: (B)

The time period for proton will be higher

Answer 2

We know that time period

(Since q and B are same)

$\bullet \bullet$ Mass of proton > Mass of electron

$\therefore$ Time period of proton > Time period of electron