A uniform electric field and a uniform magnetic field are a…

Physics Moving Charge and Magnetism NEET Previous Year Question MCQ (Single Correct)

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron

will turn towards right of direction of motion

speed will decrease

speed will increase

will turn towards left of direction of motion.

Text Solution

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The correct answer is:

Force on electron due to electric field,

Force on electron due to magnetic field,

Since and are in the same direction.

Total force on the electron,

Electric field opposes the motion of the electron, hence speed of the electron will decrease.

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