Concept explainers
(a) To determine:
How does the energy stored in a capacitor change when a dielectric is inserted if, the capacitor is isolated, so Q does not change?
Answer to Problem 14Q
Solution:
Energy stored decreases.
Explanation of Solution
We have potential energy of a capacitor given by, ,where C is the capacitance, Q is the charge and V is the voltage.
When capacitor is isolated Q remains constant, so we have to use , when dielectric is used we have , where K is the dielectric constant.
Which means energy stored decreases.
(b) To determine:
How does the energy stored in a capacitor change when a dielectric is inserted if the capacitor remains connected to a battery, so V does not change?
Answer to Problem 14Q
Solution:
Energy stored decreases.
Explanation of Solution
Here V is constant, so we have to use , when dielectric is used we have , where K is the dielectric constant.
Which means energy stored increases.
Chapter 17 Solutions
Physics: Principles with Applications
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