Dielectrics: When a dielectric material is introduced between the plates of a parallel-plate capacitor and completely fills the space, the capacitance increases by a factor of 4. What is the dielectric constant of the material that was introduced?
A. 0.4
B. 1/4
C. 2
D. 4
E. None of the other choices is correct.
Answer: D
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What will be an ideal response?