Electric fields of a hallow ball

AI Thread Summary
The discussion centers on the electric field generated by a hollow glass ball with a negative charge. At location A, which is inside the sphere, the electric field is indeed 0 N/C, as the electric field inside a uniformly charged hollow conductor is zero, regardless of the material being an insulator. At location B, outside the sphere, the electric field is calculated to be approximately 2.14 x 10^6 N/C, which is correct. A hydrogen atom placed at location A would polarize due to the influence of the nearby negative charges, but the assertion that all charges contribute to the electric field at location A is incorrect. Overall, the key points clarify the behavior of electric fields in relation to charged hollow spheres.
Kibbel
Messages
27
Reaction score
0

Homework Statement



A hollow ball of radius 5 cm, made of very thin glass, is rubbed all over with a silk cloth and acquires a negative charge of -9.5e-08 C which is uniformly distributed all over its surface. Location A, shown in the diagram, is inside the sphere, 1 cm from the surface. Location B, shown in the diagram, is outside the sphere, 2 cm from the surface. There are no other charged objects nearby.
Which of the following statements about Eball, the magnitude of the electric field due to the ball, are correct? Select all that apply.

1. At location A Eball is 0 N/C.
2. At location B Eball is 2.14 x10^6 N/C.
3.A hydrogen atom at location A would polarize because it is close to the negative charges on the surface of the sphere.
4.All of the charges on the surface of the sphere contribute to Eball at location A.


Homework Equations


(1/4*pi*epsilon)*Q/R^2


The Attempt at a Solution


So i checked at point B that the it is ~2.14 x10^6 N/C. I thought that inside the sphere the electric field is 0, but its an insulator so that means its not. And I am guessing that all of the charges contribute to Eball at location A?

is that looking correct?
 
Physics news on Phys.org
Ill go through my thoughts again for each answer:

1. I do not believe that at point A the E of the ball is 0. (Location A is inside the sphere) This is because in an insulator even though the charge on the outside is uniformly distributed, the A is not in the center.

2. That is correct, the location at B is 2.14, according to the numbers given uptop

3.I believe if you placed a hydrogen atom at location A it would polarize because on an insulator there are not free ions to move around so the electron cloud on the atom would move, polarizing it.

4. Yes I do believe that all of the charges on the surface of the sphere act on the location A inside the sphere. And this is why it is cause to not have a field of 0

so, No, Yes, Yes, no, does anyone know if I'm correct, or at least on the right track?
 
bumpinnnn
 
somebody love me please?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Electric field external to Conducting Hollow Sphere with charge inside
Replies
23
Views
3K
Electric Field Inside a Conducting Sphere: Is it Always Zero?
Replies
1
Views
1K
Confused about direction of electric field
Replies
7
Views
3K
Why Is Work Positive When Done Against the Electric Field?
Replies
22
Views
3K
Direction of electric field vector on the surface of charged conductor
Replies
9
Views
1K
Find charge inner/hollow sphere
Replies
2
Views
2K
Electric Field Inside Cylindrical Capacitor
Replies
2
Views
2K
Capacitors, equipotentials, and electric fields
Replies
5
Views
953
Flux through a cylindrical surface enclosing part of a sphere
Replies
9
Views
557
Find the magnitude of the electric field at point P
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top