Q. 44.5( 2 Votes )

Which of the following particles will describe the smallest circle when projected with the same velocity perpendicular to a magnetic field?
A. Electron

B. Proton

C. He+

D. Li+

Answer :

In the options given election has a lowest charge.

Electron < Proton < He+ <Li++


Formula used: The magnetic force is given by



Where F is magnetic force


q is electric charge =


v is velocity



m is mass of the charge particle


v is velocity


r is radius of the projectile motion






Here v and B are constants and q is same for all the charge particles. r is proportional to m. If radius is small radius will become small. Electron exhibits light weight among the all other charge particles. Because of light weight it will creates a circle with a small radius when it is projected. So option A is correct.

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