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JEE Main 2006 (AIEEE) · Moving Charge in a Magnetic Field

Moving Charge in a Magnetic Field question from JEE Main 2006 (AIEEE)

Q116JEE Main 2006 · AIEEEEasy

Moving Charge in a Magnetic Field

In a 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 in this region. The path of the particle will be a

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Answer: (b)

Released from rest, the particle is accelerated by $q\vec E$ along $\vec E$ .
Its velocity is then along $\vec E \parallel \vec B$ , so $q(\vec v\times\vec B) = 0$ always.
Only a force along the line of motion acts, so the path is straight.
So the answer is (b) straight line.

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