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Transcript of Dielectrics
A capacitor is charged to a value of Q and taken out of a circuit. This will make an electric field as shown.
The charges will orient themselves throughout it, and give a net charge as shown, and produce another electric field
Now insert a dielectric
Resulting in a total electric field
This ratio of the old electric field to the new, is called the dielectric constant.
A dielectric changes the capacitance and other quantities.
The epsilon in these equations is the permittivity of free space.
Now the space on longer is free, it becomes:
In equation for a capacitor with epsilon will be changed.
Depending on when the capacitor is put in, the charge or potential will change.
while in a circuit
out of a circuit
A 4 nF capacitor is charged in a circuit to a value of 9 V. What is the amount of charge on each plate, before and after
a dielectric with a constant of 4.7 is inserted?
If first removed from the circuit then inserted?