A Levels Physics (9702)•9702/11/O/N/21
Explanation
Electric field strength definition Steps:
- Recall that electric field strength measures the force experienced by charges in an electric field.
- Identify the standard formula: E = F / q, where F is the electrostatic force and q is the charge.
- Note that it acts on a small positive test charge to avoid disturbing the field.
- Compare choices: only one matches force per unit charge on a charge.
Why A is correct:
- It directly matches the definition E = F / q for the force on a small positive test charge.
Why the others are wrong:
- B describes gravitational field strength (g = F / m).
- C mixes mass and charge, irrelevant to electric fields.
- D swaps charge and mass, confusing electric with gravitational concepts.
Final answer: A
Topic: Electric fields and field lines
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