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July 30, 2015

Homework Help: Physics- Circuits

Posted by Bobby on Saturday, April 12, 2008 at 8:05pm.

A 100-microCoulomb parallel-plate capacitor is charged with a 24V power supply, then is disconnected from the power supply.

a) The plates are moved 0.01 m apart to 0.05 m apart. What happens numerically, to the:
i. Capacitance of the device?
ii. Potential difference between the plates?
iii. Charge on the plates?
iv. Amount of energy stored in the capacitor?

b) A dielectric with constant k=4 is inserted into the gap (which is still 0.05m). What happens to the:
i. Capacitance of the device?
ii. Potential difference between the plates?
iii. Charge on the plates?
iv. Amount of energy stored in the capacitor?
v. When the dielectric is inserted, is the dielectric pulled in between the plates, or do you have to push it in there? Explain.

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