Question : A helium nucleus enters perpendicularly in magnetic field B with velocity then magnetic force acting on it will be
(A). 2 Bev
(B). zero
(C). evB
(D). evB/2
Question : A helium nucleus enters perpendicularly in magnetic field B with velocity then magnetic force acting on it will be
(A). 2 Bev
(B). zero
(C). evB
(D). evB/2
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