Discussion
Match the change with its effect on a capacitor's capacitance.
1. Doubling the plate area 2. Doubling the separation 3. Doubling the relative permittivity
P. Halves it Q. Doubles it R. Doubles it also
Answer: B
Area and permittivity appear in the numerator and separation in the denominator, so the first and third double the capacitance and the second halves it. All three effects are exploited in practical capacitor design, thin dielectrics and large rolled areas most of all.
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