You have a parallel plate capacitor (with air between its plates) which is attac

Question

You have a parallel plate capacitor (with air between its plates) which is attached to a voltage source until the capacitor is fully charged.

(a)While the capacitor is still attached to the voltage source, you move the capacitor's plates closer together; which of the following will occur (check all that apply)?

the capacitor's capacitance will increase

the capacitor's capacitance will decrease

the capacitor's capacitance will remain the same

the magnitude of the charge on each of the capacitor's plates will increase

the magnitude of the charge on each of the capacitor's plates will decrease

the magnitude of the charge on each of the capacitor's plates will remain constant

the potential difference across the capacitor's plates will increase

the potential difference across the capacitor's plates will decrease

the potential difference across the capacitor's plates will remain the same

the potential energy stored in the capacitor will increase

the potential energy stored in the capacitor will decrease

the potential energy stored in the capacitor will remain the same

more information is needed to be able to answer this

(b)After detaching the capcitor from the voltage source, you move the capacitor's plates farther apart; which of the following will occur (check all that apply)?

the capacitor's capacitance will increase

the capacitor's capacitance will decrease

the capacitor's capacitance will remain the same

the magnitude of the charge on each of the capacitor's plates will increase

the magnitude of the charge on each of the capacitor's plates will decrease

the magnitude of the charge on each of the capacitor's plates will remain constant

the potential difference across the capacitor's plates will increase

the potential difference across the capacitor's plates will decrease

the potential difference across the capacitor's plates will remain the same

the potential energy stored in the capacitor will increase

the potential energy stored in the capacitor will decrease

the potential energy stored in the capacitor will remain the same

more information is needed to be able to answer this

Explanation / Answer

a) The following will occur

the capacitor's capacitance will increase ( capacitance is inversly proportional to distance)

the magnitude of the charge on each of the capacitor's plates will remain constant

the potential difference across the capacitor's plates will decrease ( potential difference is proportional to distance)

the potential energy stored in the capacitor will decrease

b) the following will occur

the capacitor's capacitance will decrease ( capacitance is inversly proportional to distance)

the magnitude of the charge on each of the capacitor's plates will remain constant

the potential difference across the capacitor's plates will increase ( potential difference is proportional to distance)

the potential energy stored in the capacitor will increases

c) in RC circuit the time constant is T= R*C

here effective resistance is Reff= R1 * R2/(R1+R2)

                                      Reff= 6/7 kOHMS = 857.14 ohms

T = 857.14 * 5 * 10-6 s = 4.28 ms

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