APFIVE Electric Field in a Capacitor with Dielectric
A parallel-plate capacitor with plate area A and separation d is charged to a total charge Q and then disconnected from the battery. A dielectric slab with a constant κ = 3 is then inserted, filling the entire plate area over half the separation distance. What is the magnitude of the electric field in the air-filled region of the capacitor?
A
Q/(ε₀A)
B
4Q/(3ε₀A)
C
3Q/(2ε₀A)
D
2Q/(3ε₀A)
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