JEE · NEET Previous Year Question
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
Topic: NEET PYQ
Answer: B. Full step-by-step solution below.
- Awill turn towards right of direction of motion
- Bspeed will decrease
- Cspeed will increase
- Dwill turn towards left of direction of motion.
Correct answer: B
Solution
(b) 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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