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

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

Option: 1

straight line


Option: 2

circle


Option: 3

helix


Option: 4

cycloid


Answers (1)

best_answer

Due to electric field \mathbf{E}  the force on a particle of charge \mathbf{q} is  \mathrm{\mathbf{F}=q \mathbf{E}}  in the direction of the electric field. Since \mathrm{\mathbf{E}}  is parallel to \mathrm{\mathbf{B}} , the velocity \mathrm{\mathbf{v}}  of the particle is parallel to \mathrm{\mathbf{B}}. Hence \mathrm{\mathbf{B}}  will not affect the motion of the particle since \mathrm{\mathbf{v}} \mathrm{\mathbf{\times \mathbf{B}=0}}. Thus, the correct choice is (a).

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Gaurav

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