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An electron is moving along the positive x-axis. If the uniform magnetic field is applied parallel to the negative z-axis, then
A. The electron will experience magnetic force along positive y-axis.
B. The electron will experience magnetic force along negative y-axis.
C. The electron will not experience any force in magnetic field.
D. The electron will continue to move along the positive x-axis.
E. The electron will move along circular path in magnetic field.
Choose the correct answer from the options given below.

Asked in JEE Main 13th April 2nd Shift 2023 · Lorentz force and work done

• (1) B and E only
• (2) A and E only
• (3) B and D only
• (4) C and D only

Step-by-step solution

Why the other options are wrong

• (2) Forgets the negative sign of the electron's charge, flipping the force direction.
• (3) Gets the force direction right but forgets that a perpendicular force bends the path.
• (4) Thinks the force vanishes, as if the field were parallel to the velocity.

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