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Q.

Two particles  A  and  B of masses mA and  mB respectively and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are vA and vBrespectively, and the trajectories are as shown in the figure. The

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a

mAvA < mBvB 

b

mAvA > mBvB 

c

mA< mB and vA <vB 

d

mA= mB and  vA =vB 

answer is B.

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Detailed Solution

For equal charge of the particles, radius

r α (mv)  and so mAvA > mBvB 

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