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JEE Main 2026 Preparation: Question Papers, Solutions, Mock Tests & Strategy Unacademy » JEE Study Material » Physics » Problems on Capacitor and Capacitance

Problems on Capacitor and Capacitance

This article will highlight problems on capacitor and capacitance and their functions and significance.

Table of Content
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What are capacitors and capacitance?

The capacitor is a battery that has two metal plates. The metal plate, called the anode, has a positive charge and the other metal plate, which is called the cathode or grid, has negative control. A capacitor helps to store energy in an electrical system. For example, it is used in electric turbines to help prevent sparks and provide power to motors connected to this equipment.

What are its functions?

  1. To store energy:

A capacitor is a device that stores energy. It transfers this power from one part of the system to another and can take some time to finish its task.

  1. To prevent surges and sparks:

When you plug something in to an electric outlet, it generates a sudden surge of electricity, and the spark from this surge can damage the equipment plugged in. Once the capacitor is connected to the electrical system, it absorbs that surge so that when you unplug something, there will be no sparks or any other damage caused by an electrical surge.

  1. To smooth out sharp changes in current:

AC capacitor is used to smooth out rapid changes in electrical systems. It can also be used as a regulator and control the flow of power to the system.

What are the essential factors that you need to know about capacitors?

A capacitor connected to an electrical circuit will lose its charge over time, mainly if used for an extended period. However, the rate at which the demand fades varies from one type of capacitor to another and from one type of material being used. Hence there are more than 100 factors that affect this process. Therefore, it doesn’t matter if the equipment is in use; it will lose its charge over time. If you want to find out how fast a capacitor is losing its head, you can use a multimeter device.

For this reason, most capacitors have to be replaced every 5-7 years. The life of a capacitor is dependent on the quality of the materials being used and the amount of time it was placed in the circuit. 

How does capacitance work?

Capacitance is an electrical property that makes it possible for an object to store electricity. It is measured in farads (F), a unit of capacitance. The amount of charge stored in a capacitor can be calculated by taking the product of the capacitance and the amount of payment used.

Why should they be replaced over time?

In the beginning, capacitors are usually reliable. However, they lose their ability to store a charge as time goes on. They are especially at risk of losing a significant amount of their property if it is exposed to high temperatures and humidity for long periods. The longer a capacitor is used in an electrical system, the more likely it will fail over time.

What happens when the capacitor fails?

Suppose you fail to replace the capacitor when it is needed. In that case, you will notice that it has lost its ability to absorb electricity or has lost some of its capacity to provide power smoothly in your electrical system. When capacitors fail, your electrical equipment could be damaged, leading you to spend money on repairs and replacements.

Problems with Capacitor And Capacitance

1) Older capacitors tend to lose their practical capacitance value.

2) The capacitor will appear leaky, cracked, or bulging.

3) They will produce high-pitched noises, along with loud hums.

4) They can produce high-pitched noises that make it hard for you to listen to them.

Where can you find capacitors?

Capacitors are standard in electronic devices, including computers and radios and power supplies and motors. You can find them in radios because they help tune radio signals so that the amplifier has a steady flow of electricity coming into it. You can also find them in power supplies because they help smooth out the flow of electricity from the wall outlet.

You can also find capacitors in motors and electric turbines to help control the motor’s rotation. They are also used in percolator coffee pots and other devices that use wire coils for their operation.

To measure capacitance of a capacitor, you need to use a multimeter. This device will measure the capacitance value of your capacitor, which will allow you to buy the correct replacement part from your local hardware store. When you go to the hardware store, make sure that you bring your multimeter so that they can check its readings against their stock before purchasing one.

Conclusion

This article highlights the problems, functions, and significance of capacitors and capacitance. The advantage of the capacitor is that it keeps the electrical device working well without interruption.

faq

Frequently asked questions

Get answers to the most common queries related to the JEE Examination Preparation.

What is the difference between capacitors and capacitance?

Ans: Capacitance is the ability of a capacitor to store charg...Read full

What are essential factors that you need to know about capacitors?

Ans. Capacitors vary in quality, so knowing their specifications will help you...Read full

What happens when the capacitor fails?

Ans. If you fail to replace the capacitor when needed, then your electrical equipment could be damaged, leading you ...Read full

Where can you find capacitors?

Ans. You can find capacitors in everyday electronic devices, such as radios, power supplies, and motors. They are al...Read full

Ans: Capacitance is the ability of a capacitor to store charge and hold it consistently over time. Capacitance is measured in farads (F). Capacitor stores electrical charge temporarily. It can also indicate when too much power is being drawn from an electrical source.

Ans. Capacitors vary in quality, so knowing their specifications will help you choose the right one for your system. They also have different capacitance values, so you need to know how much charge your capacitor is storing at any given moment. You should also be aware of their voltage tolerances and operating temperatures to choose the right one better.

1/C=1/1.000μF+1/2.000μF+1/5.000μF

1/C=1.7/μF

By inverting the result, we get the value of C. 

C=μF/1.7=0.588μF

Ans. If you fail to replace the capacitor when needed, then your electrical equipment could be damaged, leading you to spend money on repairs and replacements. By being aware of the symptoms of a failing capacitor, you can be prepared for it and prevent any possible damages from happening.

Ans. You can find capacitors in everyday electronic devices, such as radios, power supplies, and motors. They are also used in percolator coffee pots and other devices that use wire coils for their operation. To replace a capacitor, you need to use a multimeter. This device will measure the capacitance value of your capacitor, which will allow you to buy the correct replacement part from your local hardware store. When you go to the hardware store, make sure that you bring your multimeter so that they can check its readings against their stock before purchasing one.

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