Concept explainers
(a)
The electric field at a point on the axis and
(a)
Answer to Problem 41P
The electric field at a point on the axis and
Explanation of Solution
Write the expression for the surface charge density.
Here,
Write the expression for the electric field at a point along the axis of the circular disk carrying charge.
Here,
Write the constant value for the Coulomb’s constant
Conclusion:
Convert the radius of the disk from
Convert the distance of the disk from
Substitute
Substitute
Here,
Simplify the above equation to find
Therefore, the electric field at a point on the axis and
(b)
The comparison of the answer from part (a) with the field computed from the near-filed approximation
(b)
Answer to Problem 41P
The value of the field computed from the near field approximation is
Explanation of Solution
Write the expression for the magnitude of the electric field
Here,
Write the expression for the change in the field computed from the near-filed approximation.
Here,
Conclusion:
Substitute
Substitute
Therefore, the value of the field computed from the near field approximation is
(c)
The electric field at a point on the axis of the disk and
(c)
Answer to Problem 41P
The electric field at a point on the axis and
Explanation of Solution
Write the expression for the electric field at a point on the axis of the circular disk carrying charge.
Here,
Conclusion:
Convert the distance of the disk from
Substitute
Here,
Simplify the above equation to find
Therefore, the electric field at a point on the axis and
(d)
The comparison of the answer from part (c) with the electric field obtained by treating the disk as a
(d)
Answer to Problem 41P
The value of the field computed is
Explanation of Solution
Write the expression for the electric field at a distance of
Conclusion:
Substitute
Substitute
Therefore, the value of the field computed is
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Chapter 23 Solutions
Physics For Scientists And Engineers With Modern Physics, 9th Edition, The Ohio State University
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