- #1
Stealth95
- 19
- 4
Hello. I am not sure if I must post here. The problem is not for homework, it derived from a classmate's question.
We have a large quantity of liquid dielectric with relative permittivity [itex]\varepsilon [/itex] and a charge [itex]Q[/itex] immersed in the liquid in depth [itex]h[/itex]. We bring another charge [itex]q[/itex] in distance [itex]h[/itex] above the surface of the liquid, such as the line connecting [itex]Q[/itex] and [itex]q[/itex] is perpendicular at the surface. The charges are not free to move. We need to find the total force on the second charge [itex]\displaystyle{q}[/itex].
You can find my attempt at the attachments. Sorry for not posting it in Latex but I already had written the PDF file.
This year I finished high school and I will enroll to university. I have read alone some of the methods used in my solution so I am not so familiar with them (for example delta function and bound charges). That's the reason I post here and I want to ask if there is anything wrong in my attempt.
Thanks in advance and sorry for the grammar mistakes here and in PDF (I am not good in English). :shy:
Homework Statement
We have a large quantity of liquid dielectric with relative permittivity [itex]\varepsilon [/itex] and a charge [itex]Q[/itex] immersed in the liquid in depth [itex]h[/itex]. We bring another charge [itex]q[/itex] in distance [itex]h[/itex] above the surface of the liquid, such as the line connecting [itex]Q[/itex] and [itex]q[/itex] is perpendicular at the surface. The charges are not free to move. We need to find the total force on the second charge [itex]\displaystyle{q}[/itex].
Homework Equations
- Linear dielectric polarization: [itex]\vec{P}=(\varepsilon -1)\varepsilon _{0}\vec{E_f}[/itex]
- Bound charges: [itex]\rho _b=-\nabla \cdot \vec{P}[/itex] and [itex]\sigma _b=\vec{P} \cdot \hat{k}[/itex]
- Coulomb's law
The Attempt at a Solution
You can find my attempt at the attachments. Sorry for not posting it in Latex but I already had written the PDF file.
This year I finished high school and I will enroll to university. I have read alone some of the methods used in my solution so I am not so familiar with them (for example delta function and bound charges). That's the reason I post here and I want to ask if there is anything wrong in my attempt.
Thanks in advance and sorry for the grammar mistakes here and in PDF (I am not good in English). :shy: