Why is the electric field inside the dielectric cancelling?

AI Thread Summary
The discussion centers on the behavior of the electric field within a dielectric material inserted between capacitor plates. It highlights a misunderstanding regarding the cancellation of the electric field, with the user questioning their teacher's explanation. The key point is that the dielectric polarizes in response to the electric field, generating an opposing field that reduces the overall electric field between the plates. This polarization effect leads to a net electric field that is less than expected, affecting the force on the capacitor plates. Ultimately, the interaction between the plates and the dielectric results in a complex field behavior that can be counterintuitive.
Abhishek Das
Messages
4
Reaction score
0
So, I was studying force between the plates of a capacitor when a dielectric is inserted.

Here is my question
https://ibb.co/cenvXk
Shouldn't it be like this picture below
https://ibb.co/kOUsCk
So, why is my teacher saying that the electric field inside the dielectric cancelling.
So, what would be the force on a plate then?
 
Physics news on Phys.org
The reason is that the plate polarises the diaelectric and that creates the oposite field inside the other plate which cancels with the first.
 
Insight said:
The reason is that the plate polarises the diaelectric and that creates the oposite field inside the other plate which cancels with the first.
But, they are in same direction
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Electric field between capacitor plates when a dielectric slab is inserted
Replies
14
Views
2K
Two different dielectrics between parallel-plate capacitor
Replies
6
Views
2K
Why can we model spherical capacitor with two dielectrics as two capacitors in series?
Replies
4
Views
2K
Force between the plates of a capacitor with dielectric slab inserted
Replies
32
Views
4K
Electric displacement field density equation
Replies
1
Views
773
How does the presence of a dielectric change the max V of a capacitor?
Replies
6
Views
3K
A disconnected capacitor with two dielectrics in parallel
Replies
8
Views
2K
Why Does the Electric Field Sum Instead of Cancel with Opposite Charges?
Replies
6
Views
2K
Energy Changes in Capacitor After Disconnecting from Battery
Replies
4
Views
1K
Capacitor 1/3 filled with a dielectric
Replies
40
Views
3K

Hot Threads

Recent Insights

Back
Top