IB · D · multiple choice
Fields · Question 6
Fields · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 1
- Topics
- 1
- Answer
- Complete
Which statement about equipotential surfaces and field lines is correct for any static field?
- A
They are parallel to one another.
- B
They are perpendicular to one another.
- C
Work is done moving a charge along a field line but not along an equipotential.
- D
Both B and C are correct.
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Answer and reasoning
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is D: Both B and C are correct.
- 2
Both statements are true and follow from the same fact: if a field had a component along an equipotential, moving a charge along it would do work and the potential would change. Candidates who stop at the first true statement they meet choose B or C.
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