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# Moving Particle of Mass

APPHEM-B6IZJE

A particle of mass m and charge $+Q$ is moving in a magnetic field of strength $B$. The particle moves in a circular path of radius $R$.

Which of the following changes would result in a circular path of radius $2R$?

A

Double the mass

B

Double the charge

C

Reduce the speed by half

D

Reduce the speed by four