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  4. If an electron of velocity (2 hat i +3 hat j ) is subjected to magnetic field of 4 hat k , then its :- (a) path will change (b) speed does not change (c) path must be circular (d) momentum is constant

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Q. If an electron of velocity $(2 \hat{ i }+3 \hat{ j })$ is subjected to magnetic field of $4 \hat{ k }$, then its :-
(a) path will change
(b) speed does not change
(c) path must be circular
(d) momentum is constant

Solution:

As velocity perpendicular $B$, so electron perform uniform circular motion.