Question

# A charged particle is released from rest in a region of uniform electric and magnetic fields which are parallel to each other. The particle will move on a

A
Straight line
B
Circle
C
Helix
D
Cycloid
Solution
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#### The correct option is A Straight lineWhen the particle is released from rest, it starts to move along the fields due to application of electric field. The magnetic force acting on a moving charged particle is given by →F=q(→v×→B)Since velocity and magnetic fields are parallel, no magnetic force acts on the particle, hence it continues to move in a straight line along with constant acceleration.

1
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