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Electric Circuits
Answer with either True ir False
(a) From the definition of capacitance, C = Q/V, it follows that an uncharged capacitor has a capacitance of zero.
(b) As described by the definition of capacitance, the potential difference across an uncharged capacitor is zero.
(a) From the definition of capacitance, C = Q/V, it follows that an uncharged capacitor has a capacitance of zero.
(b) As described by the definition of capacitance, the potential difference across an uncharged capacitor is zero.
Electric Circuits
You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. When you increase the plate separation, do the following quantities (a) increase , (b) decrease or (c) stay the same?
(i) Capacitance
(ii) Charge
(iii) Electric field between the plates
(iv) Voltage
(i) Capacitance
(ii) Charge
(iii) Electric field between the plates
(iv) Voltage
Electric Circuits
Why is it dangerous to touch the terminals of a high-voltage caoacitor even after the voltage source that charged the capacitor is disconnected from the capacitor?
(b) What can be done to make the capacitor safe to handle after the voltage source has been removed?
(b) What can be done to make the capacitor safe to handle after the voltage source has been removed?
Electric Circuits
Assume you want to increase the maximum operating volge of a paralle-plate capacitor. Describe how you can do that with a fixed plate separation.
(a) If you werw asked to design a capacitor in which small size and large capaciance were required, what would be the two most important factors in your design?
(a) If you werw asked to design a capacitor in which small size and large capaciance were required, what would be the two most important factors in your design?
Electric Circuits
Assume you want to increase the maximum operating volge of a paralle-plate capacitor. Describe how you can do that with a fixed plate separation.
(a) If you werw asked to design a capacitor in which small size and large capaciance were required, what would be the two most important factors in your design?
(a) If you werw asked to design a capacitor in which small size and large capaciance were required, what would be the two most important factors in your design?
Electric Circuits
An air-filled capacitor is charged, then disconnected from the power supply, and finally connected to a voltmeter. Explain how and why the potential difference changes when a dielectric is inserted between the plates of the capacitor.
(b) The sum of the charges on both plates of a capacitor is zero. What does the capacitor stote?
(b) The sum of the charges on both plates of a capacitor is zero. What does the capacitor stote?
Electric Circuits
Because the charges on the plates of a parallel-plate capacitor are opposite in sign, they attract each other. Hence, it would take positive work to increase the plate separation. What type of energy in the system changes due to the external work done in this process?
Electric Circuits
An air filled capacitor consists of two parallel plates, each with an area of 7.60 cm^2, separated by a distance of 1.80mm. A 20.0V potential difference is applied to these plates. Calculate
(i) the electric field between the plates
(ii) the capacitance and the charge on each plate.
(i) the electric field between the plates
(ii) the capacitance and the charge on each plate.
Electric Circuits
Two capacitors C1 = 5.00 x 10^(-6)F and C2 = 12.0 x10^(-6)F, are connected in parallel, and the resulting combination is connected to a 9.00V battery. Find
(a) the equivalent capacita0nce of the combination
(b) the potential difference across each capacitor and
(c) the charge stored on each capacitor.
(a) the equivalent capacita0nce of the combination
(b) the potential difference across each capacitor and
(c) the charge stored on each capacitor.
Electric Circuits
A 10.0 x10^(-6)F capacitor is charged by a 10.0V battery through a resistance R. The capacitor reaches a potential difference of 4.00V in a time interval of 3.00s after charging begins. Find R.
