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Mr Virtual
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Pleeeease Help! Why a dielectric absorbs only a certain amt of field
Hello Everyone!
I am a new member in this forum.
What we learn at school regarding dielectrics is: When you apply an electric field on a dielectric, the molecules of the dielectrics polarize and stretch (the electrons/anions shift towards the positive terminal, and the cations shift towards the negative terminal), which creates an opposing field, which reduces the net applied electric field.
This is what I think the above statement means : that if you have two metal plates separated by a dielectric medium, and apply an electric field across the two plates, thenthe field travels from the positive plate, enters the dielectric, does work in polarizing/stretching its molecules, gets reduced and reaches the opposite plate with this reduced value.
But I ask: why does the electric field only do a limited amount of work? Why doesn't the field stretch the dielectric's molecules to the fullest extent possible for it? Since electric field is also a kind of force, why isn't this whole force converted to work done in stretching the dielectric.
According to me, the molecules of the dielectric should consume the whole applied electric field and stretch accordingly and, thus, no electric field should ever reach the negative plate, as all the field is converted to work done in stretching. This is what happens in an insulator.
Then what makes the dielectric absorb a limited amount of field and let the rest of it pass through.
Please answer me this question in any way you know (quantum approach, QED or classical approach), but make it with minimum or no mathematics, because I want to understand the theoretical portion, and also because since I am still school student, I won't understand the complicated quantum maths much.
Love to you all and warm regards.
Mr Virtual
Hello Everyone!
I am a new member in this forum.
What we learn at school regarding dielectrics is: When you apply an electric field on a dielectric, the molecules of the dielectrics polarize and stretch (the electrons/anions shift towards the positive terminal, and the cations shift towards the negative terminal), which creates an opposing field, which reduces the net applied electric field.
This is what I think the above statement means : that if you have two metal plates separated by a dielectric medium, and apply an electric field across the two plates, thenthe field travels from the positive plate, enters the dielectric, does work in polarizing/stretching its molecules, gets reduced and reaches the opposite plate with this reduced value.
But I ask: why does the electric field only do a limited amount of work? Why doesn't the field stretch the dielectric's molecules to the fullest extent possible for it? Since electric field is also a kind of force, why isn't this whole force converted to work done in stretching the dielectric.
According to me, the molecules of the dielectric should consume the whole applied electric field and stretch accordingly and, thus, no electric field should ever reach the negative plate, as all the field is converted to work done in stretching. This is what happens in an insulator.
Then what makes the dielectric absorb a limited amount of field and let the rest of it pass through.
Please answer me this question in any way you know (quantum approach, QED or classical approach), but make it with minimum or no mathematics, because I want to understand the theoretical portion, and also because since I am still school student, I won't understand the complicated quantum maths much.
Love to you all and warm regards.
Mr Virtual