
Concept explainers
(a)
The magnitude and direction of electric field between the plates.
(a)

Answer to Problem 16E
The magnitude of electric field between the plates is
Explanation of Solution
Given that the side length of the square plates is
Write the expression for the magnitude of electric field between two oppositely charged plates.
Here,
The surface charge density is defined as the charge per unit area. Write the expression for the surface charge density.
Here,
Write the expression for the area of a square plate.
Here,
Use equation (II) in (I).
Use equation (III) in (IV).
Conclusion:
Substitute
The total electric field between two oppositely charged plates are always directed from positive plate to negative plate (refer Figure 16.15 d).
Therefore, the magnitude of electric field between the plates is
(b)
The magnitude and direction of the force on an electron placed in between the plates.
(b)

Answer to Problem 16E
The magnitude of the force on the electron is
Explanation of Solution
It is obtained that the electric field is
Write the expression for the electrostatic force on a charged particle in an electric field.
Here,
The charge of electron is
Conclusion:
Substitute
The negative sign indicate that the direction of force is opposite to the direction of electric field.
Therefore, the magnitude of the force on the electron is
(c)
The work needed to move an electron from positive plate to negative plate.
(c)

Answer to Problem 16E
The work needed to move an electron from positive plate to negative plate is
Explanation of Solution
It is obtained that the magnitude of force on the electron is
Work has to be done to move an electron from positive plate to negative plate against the electric field. The amount of work required can be computed using the equation,
Here,
Conclusion:
Substitute
Therefore, the work needed to move an electron from positive plate to negative plate is
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Chapter 16 Solutions
General Physics, 2nd Edition
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