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LekaFEV [45]
3 years ago
9

The plates of a parallel-plate capacitor each have an area of 0.1 m^2 and are separated by a 0.9 mm thick layer of porcelain. Th

e capacitor is connected to a 14 V battery. (The dielectric constant for porcelain is 7.) (a) Find the capacitance. (b) Find the charge stored. (c) Find the electric field between the plates.
Physics
1 answer:
podryga [215]3 years ago
4 0

Answer: a) 6.88 nF; b) 96 .32 nC; c) 108.83 * 10^3 N/C

Explanation: In order to solve this problem we need to used the expresion for the capacitor of two parallel plates, which is given by:

C=εo*A/d;  A is the area and d the separaction between the plates.

inside the capacitor there is a porcelain layer so we have to multiply by the dielectric constant (k=7).

Then C=8.85*10^-12*7*0.1 /0.0009=6.88 nF

Also we know that ΔV=Q/C

Q= C*ΔV= 6.88 nF* 14 V= 96 .32 nC

Finally, The electric field between the plates is given by:

E= σ/εo= Q/(A*εo)= 96.32 /(0.1*8,85* 10^-12)= 108.83 * 10^3 N/C

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