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A uniform magnetic field exists in region which forms an equilateral triangle of side a.· The magnetic field is perpendicular to the plane of the triangle. A charge q enters into this magnetic field perpendicular to a side with speed v. The charge enters from mid-point and leaves the field from mid-point of other side. Magnetic induction in the triangle is

a
mvqa
b
2mvqa
c
mv2qa
d
mv4qa

detailed solution

Correct option is B

The charged particle moves in a circle of radius a/2.qvB=mv2a/2       or        B=2mvqa

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