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

• A. speed will decrease
• B. speed will increase
• C. will turn towards left direction of motion
• D. will turn towards right direction of motion

Hint:

The force on a charged particle due to a magnetic field acts perpendicular to its velocity and opposes its motion in the direction of the field.

Answer 1

The Correct Option is A

When an electron moves in both electric and magnetic fields that are along the same direction, the magnetic force will oppose the electron's motion, causing its speed to decrease over time.

Step 2: Conclusion.
The speed of the electron will decrease, corresponding to option (a).