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Questions  

Two identical particles having the same mass m and charges +q and -q separated by a distance d enter in a uniform magnetic field B directed perpendicular to paper inwards with speeds v1 and v2 as shown in figure. The particles will not collide if

a
d>mqBv1+v2
b
d
c
d>2mqBv1+v2
d
v1=v2

detailed solution

Correct option is A

The particles do not collide, if they do not touch each other when they complete their circlesd>2r1+2r2d>2mv1qB+mv2qBd>2mqBv1+v2

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