In the direction indicated by an electric field line:
Correct answer: C. The potential must decrease
- A. The electric field strength must increase
- B. The electric field strength must decrease
- C. The potential must decrease
- D. None of these
Explanation
The correct answer is that the potential must decrease (Option C). Electric field lines are oriented from higher to lower electric potential, indicating that potential decreases along the direction of the field. Options A and B are incorrect because electric field lines do not provide information about the magnitude of the electric field; thus, strength may vary in any direction. Option D is incorrect because Option C accurately describes the relationship between electric field lines and potential.
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