MagnetismMedium
Question
A charged particle moves through a magnetic field perpendicular to its direction. Then -
Options
A.the momentum changes but the kinetic energy is constant
B.both momentum and kinetic energy of the particle are not constant
C.both momentum and kinetic energy of the particle are constant
D.kinetic energy changes but the momentum is constant
Solution
Electrostatic force on electron. 
= - eEĵ
∴ Magnetic force on electron.
= - ev (- ĵ) × B
= evBî
The electron moves in circle with radius on x-axis.
= - eEĵ∴ Magnetic force on electron.
= - ev (- ĵ) × B = evBîThe electron moves in circle with radius on x-axis.
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