In a particular region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest into this region. The path of the particle will be
A
circle
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B
helix
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C
straight line
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D
ellipse
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Solution
The correct option is D straight line Magnetic force will act on the particle only when it's motion is perpendicular to the magnetic field, but here the particle will start moving in the direction of electric field parallel to magnetic field and by Newton's law of Inertia, it won't change direction unless an external force acts on it.