Energy stored in a capacitor

4

Hi, I'm slightly confused why energy stored in a capacitor increases when a dielectric is removed, does anyone have an explanation? what is the work being done on? i kinda get that work is done to polarize a dielectric but wouldnt the dielectric remain slightly polarised when it is being removed from the capacitor?

Reply 1

Nitrotoluene

12

Original post

by 63737

Hi, I'm slightly confused why energy stored in a capacitor increases when a dielectric is removed, does anyone have an explanation? what is the work being done on? i kinda get that work is done to polarize a dielectric but wouldnt the dielectric remain slightly polarised when it is being removed from the capacitor?

By encouraging you to retrieve information and actively engage in critical thinking, I can facilitate the development of necessary connections that you currently lack.

•

First, how does a capacitor store energy, and what affects it?

•

How does the capacitance change when the dielectric is changed?

•

What forces act on the capacitor when the dielectric is removed?

Assuming there is an initial dielectric, the dielectric increases the capacitance.

•

If you disconnect a battery, does the charge or voltage of the component remain constant when you pull it out?

•

Next, when you remove the dielectric, the capacitance decreases.

•

If the charge remains the same, what happens to the energy in the capacitor?

•

If you connect a battery (constant voltage), does the circuit present a different situation? Does the energy increase or decrease?

Some work for you:

1.

When the charged plates pull on the dielectric, work is required to remove it against the forces of the capacitor. Where does this work go?

2.

A dielectric holding a small charge does not change the energy of the capacitor. If the capacitance decreases and the charge does not change, what happens to the voltage? What happens to the energy in the capacitor?

3.

When you work to extract the dielectric, what are you working against?

4.

How does extracting or removing the dielectric change the energy of the capacitor?

Here is my 2 cents!

Reply 2

Eimmanuel

Study Forum Helper

15

Original post

by Nitrotoluene

By encouraging you to retrieve information and actively engage in critical thinking, I can facilitate the development of necessary connections that you currently lack.

•

First, how does a capacitor store energy, and what affects it?

•

How does the capacitance change when the dielectric is changed?

•

What forces act on the capacitor when the dielectric is removed?

Assuming there is an initial dielectric, the dielectric increases the capacitance.

•

If you disconnect a battery, does the charge or voltage of the component remain constant when you pull it out?

•

Next, when you remove the dielectric, the capacitance decreases.

•

If the charge remains the same, what happens to the energy in the capacitor?

•

If you connect a battery (constant voltage), does the circuit present a different situation? Does the energy increase or decrease?

Some work for you:

1.

When the charged plates pull on the dielectric, work is required to remove it against the forces of the capacitor. Where does this work go?

2.

A dielectric holding a small charge does not change the energy of the capacitor. If the capacitance decreases and the charge does not change, what happens to the voltage? What happens to the energy in the capacitor?

3.

When you work to extract the dielectric, what are you working against?

4.

How does extracting or removing the dielectric change the energy of the capacitor?

Here is my 2 cents!

Hi, I appreciate that you take the trouble to try to lead OP into answering his/her queries.
I don't know what is your level of education but it seems that when I request not to help OP in answering the question, you just literally do it for every thread without considering the nature of the question in each thread.

The thread that I request not to do the work for the students can be categorically classified as a homework question.

This thread is very different from the homework question. OP asks the question by stating his/her confusion. Under such circumstance, it would be best by providing an explanation instead of "throwing" more questions which would confuse or make OP frustrated.

You need to discern the "situation" in every thread that you want to help instead of using the same method.

Reply 3

Eimmanuel

Study Forum Helper

15

Original post

by 63737

Hi, I'm slightly confused why energy stored in a capacitor increases when a dielectric is removed, does anyone have an explanation? what is the work being done on? i kinda get that work is done to polarize a dielectric but wouldnt the dielectric remain slightly polarised when it is being removed from the capacitor?

I would recommend you give us more context, like you are attempting some questions and do not understand the answer or worked solutions or reading some material that attempts to explain that the energy in a capacitor increases when a dielectric is removed.

Reply 4

Nitrotoluene

12

Original post

by Eimmanuel

Hi, I appreciate that you take the trouble to try to lead OP into answering his/her queries.
I don't know what is your level of education but it seems that when I request not to help OP in answering the question, you just literally do it for every thread without considering the nature of the question in each thread.
The thread that I request not to do the work for the students can be categorically classified as a homework question.
This thread is very different from the homework question. OP asks the question by stating his/her confusion. Under such circumstance, it would be best by providing an explanation instead of "throwing" more questions which would confuse or make OP frustrated.
You need to discern the "situation" in every thread that you want to help instead of using the same method.

OK, I understand what you're saying. I will take your comments on board.
Krgds,
Sandro

Energy stored in a capacitor

Quick Reply

Related discussions

Articles for you

How The Student Room is moderated