Question

An electron is released from rest in a region of uniform electric and
magnetic fields acting parallel to each other. The electron will
(A) move in a straight line.
(B) move in a circle.
(C) remain stationary.
(D) move in a helical path.​

Answer 1

Answer:

(A)Move in a straight line

Explanation:

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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Answer 2

Hi friend here is your answer

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They will move in straight line

When the electron is released the force act along the axis

Electron has negative charge so

Magnetic force acting on particle

VBsin0=0

V= velocity acquired by charge particle. q=negative

F m =q V× B

=VBsin180°=0

Magnetic force zero hence all particle in straight line

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