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Chapter 19: Q7CQ (page 694)
What is the strength of the electric field in a region where the electric potential is constant?
The electric field鈥檚 strength will be zero in a region with constant electric potential.
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Voltage is the common word for potential difference. Which term is more descriptive, voltage or potential difference?
Sketch the equipotential lines a long distance from the charges shown in Figure \({\rm{19}}{\rm{.28}}\). Indicate the direction of increasing potential.
Give the reason why a dielectric material increases capacitance compared with what it would be with air between the plates of a capacitor. What is the independent reason that a dielectric material also allows a greater voltage to be applied to a capacitor? (The dielectric thus increases \(C\) and permits a greater \(V\).
Use the characteristics of the Coulomb force to explain why capacitance should be proportional to the plate area of a capacitor. Similarly, explain why capacitance should be inversely proportional to the separation between plates.
Sketch the equipotential lines for the two equal positive charges shown in Figure. Indicate the direction of increasing potential.
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