A Levels Physics (9702)•9702/12/M/J/20
Explanation
Force on electron opposes electric field direction
Steps:
- Determine electric field direction at X: points toward negative charge of dipole.
- Apply force formula F = qE, where q is charge.
- For electron, q < 0, so force direction reverses from E.
- Match reversed direction to choice D.
Why D is correct:
- D aligns with -E direction, per F = qE for negative q (Coulomb's law).
Why the others are wrong:
- A: Matches E direction, incorrect for negative charge.
- B: Perpendicular to E, violates force alignment with field.
- C: Opposite perpendicular, not matching -E.
Final answer: D
Topic: Electric fields and field lines
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