Static electric charges are charges that

Question

BlackTom AI · Accepted Answer

Static electric charges are stationary charges that accumulate on the surface of materials and do not move continuously as a current does.

Relevant knowledge points:
- Static electricity = accumulation of excess electric charge (usually electrons) on an object’s surface.
- Electric current = moving charges (flow of electrons) through a conductor (e.g., a wire).
- In ordinary electrostatic phenomena, electrons, not protons, are transferred between materials; protons are tightly bound in atomic nuclei and do not move in normal electrical processes.
- Batteries provide a potential difference that drives continuous current, not static accumulation.

Step-by-step reasoning:
1. Definition check: If charges are “static,” they must be stationary (not flowing). That matches option b.
2. Consider option a: “involve the transfer of protons between atoms.” In everyday static electricity, charge transfer occurs by electrons moving between surfaces (friction, contact, or induction). Protons remain in nuclei, so option a is incorrect.
3. Consider option c: “flow through wires.” Flowing through wires describes electric current (dynamic electricity), not static charge. Thus c is incorrect.
4. Consider option d: “are produced by batteries.” Batteries create and maintain an electromotive force that produces current when a circuit is closed. While a battery can cause charge separation in a circuit, static charges refer specifically to non-moving accumulated charges, so d is not the best description.

Why the correct answer is correct:
- Static electric charges are by definition stationary charges localized on objects (e.g., clothes clinging after drying, a charged comb attracting paper). They do not form a continuous flow; they remain until neutralized or discharged.

Other options incorrect summary:
- a: protons are not transferred in typical static processes.
- c: describes current, not static charge.
- d: batteries produce current/voltage, not the general phenomenon of stationary static charges.

Conclusion: The correct answer is b. This matches the provided answer: b.

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