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Questions  

Two charged particles 1 and 2 with same velocity, enter a region of uniform magnetic field in a direction perpendicular to the field. If the particles have the same mass, then 

a
1 is positively charged and 2 is negatively charged.
b
magnitude of charge of 1 is less than the magnitude of charge of 2
c
magnitude of charges of both particles are the same.
d
1 is negatively charged and 2 is positively charged.

detailed solution

Correct option is D

Force on charged particle moving in magnetic field is given byF→=QV→×B→. This force is the centripetal force. Therefore 1 must carry negative charge and 2 must carry positive charge.Also trajectories of the particles are circular with radius of curvature γ=VmQBi. Since r1Q2.

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