If a soap bubble is charged:
Correct answer: B. Its size increases
- A. Its size decreases
- B. Its size increases
- C. No change
- D. None of the above
Explanation
When a soap bubble is charged, either positively or negatively, the like charges spread over its surface due to electrostatic forces. These like charges repel each other, causing the bubble to expand and increase in size. Option B is correct because it accurately describes this phenomenon. Options A and C are incorrect as they suggest a decrease or no change in size, which contradicts the effects of electrostatic repulsion. Option D is incorrect because there is indeed a change.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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An electric field is the force experienced per unit positive test charge, with the field of a point charge given by E = kQ/r² and directed away from positive charges or toward negative charges. Questions involve field lines, superposition and force on a charge, while electric field must be distinguished from electric potential.
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