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A Levels Physics (9702)•9702/12/M/J/20
Question 31 from 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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