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
Medium
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Solution
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Correct option is A)
When 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.
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