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Every conductor has capacity to store charges, and the conductor that stores both positive and negative charges is called capacitor. It is also called condenser.
Capacitance=(Magnitude of charge on plate/Potential difference between the plates)
Parallel Plate Capacitors: Parallel plate capacitors are a type of capacitors which have two plates(electrodes) and dielectric(insulating material). The two plates are equal in size and parallel to each other with certain gap filled with dielectric.
Electric field between parallel plate capacitors
Spherical Capacitor(Concentric Spheres):
For single Sphere:
Combination of Capacitors:
- Charge remains same in all capacitors.
- Potential difference is different in each capacitor.
2) Parallel Capacitors:
- Charge is different in each capacitor
- Potential difference is same in each capacitor.
Energy Density: E=V/d
Some questions asked in IOE entrance exams are:
|In a 20 Vac series RC circuit, if 20 V is measured across the resistor and 40 V is measured across the capacitor, the applied voltage is:
a. 45V b. 50 V c. 55V d. 60V
Capacitor is a device used to__________
a) store electrical energy
b) vary the resistance
c) store magnetic energy
d) dissipate energy
Capacitor stores which type of energy?
a) kinetic energy
b) vibrational energy
c) potential energy
d) heat energy
Which of the following is a passive device?
d) Vaccuum Tubes