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Capacitor
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Q. Is capacitor an important topic for JEE?
Yes it is an important topic for JEE as it can be learned easily as compared to other topics and can be strengthened by practicing more and more questions for it. It also carries weight age in 12th board
Q. What is a capacitor?
Capacitor is an electronic component that stores electric charge. The capacitor is made of 2 close conductors (usually plates) that are separated by a dielectric material. The plates accumulate electric charge when connected to power source. One plate accumulates positive charge and the other plate accumulates negative charge.
Q. How many types of capacitors are there?
There are three types of capacitors
1. Spherical capacitors
2. Cylindrical capacitors
3. Parallel Plate capacitors
Q. What is the Charge on a capacitor?
Charge on a capacitor is Q
Total charge is -Q + Q= 0.
Q. What is the use of a capacitor?
Below are few uses of capacitors
1. It can be used to store energy.
2. It is used in sensors
3. Power conditioning
4. Timing
5. Used in inverters
Q. A cell has an internal resistance . Likewise , Can a cell have internal capacitance?
no
Q. just like parallel plate capacitor if there is a dielectric medium of dielectric constant inside a spherical capacitor then also it's capacitance increases by a factor of K?
es , in case of sphere also , the capacitance is multiplied by k
C = k *C0
Q. An uncharged capacitor is connected to a battery. Show that half the energy supplied by the battery is lost as heat while charging the capacitor. Asked On:20/01/2017?
Energy supllied by battery = QV
energy stored in the capacitor = 1/2CV2, C= Q/V
= 1/2QV
energy loss as heat = QV - 1/2QV