WJEC A Level Physics
WJEC A Level Physics 4.2 Electrostatic and Gravitational Fields of Force Exam Questions
Free WJEC A Level Physics exam questions on 4.2 Electrostatic and Gravitational Fields of Force, with mark schemes. Covers Coulomb's law, Newton's law of gravitation, field strength and potential.
4.2 Electrostatic and Gravitational Fields of Force exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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A Level Physics Flashcards
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About WJEC A Level Physics 4.2 Electrostatic and Gravitational Fields of Force
This topic compares electric and gravitational fields.
What you need to know
- Force laws Coulomb and Newton inverse square laws.
- Field strength E = F/q and g = F/m.
- Potential V = Q/4πε₀r and V = −GM/r.
- Field lines and equipotentials Perpendicular to each other.
Common mistakes in 4.2 Electrostatic and Gravitational Fields of Force
- Forgetting gravitational potential is negative.
- Using r as distance from the surface.
- Not squaring r in force equations.
Try three 4.2 Electrostatic and Gravitational Fields of Force exam-style questions
1. State one difference between gravitational and electric fields. (1 mark)
Show the mark scheme answer
Gravity is always attractive; electric forces can attract or repel.
2. Find g at 2R from Earth's centre if g at surface is 9.81 N kg⁻¹. (1 mark)
Show the mark scheme answer
2.45 N kg⁻¹.
3. Define gravitational potential. (1 mark)
Show the mark scheme answer
Work done per unit mass bringing a mass from infinity to that point.
4.2 Electrostatic and Gravitational Fields of Force FAQs
What does this topic cover?
Force laws, field strength and potential for electric and gravitational fields.
Why is gravitational potential negative?
Work must be done to move a mass to infinity, where potential is zero.
What is a radial field?
A field from a point mass or charge whose strength falls with r².
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
