
Concept explainers
(a)
The electric field at the distance of
(a)

Explanation of Solution
Given:
The magnitude of the two point charges is
The position of the first point charge is at
The position of the third charge is
Formula used:
Write the expression for the superposition of the electric field.
Here,
Assume
Write the expression for the electric field of the first charge.
Here,
Write the expression for the electric field of the second charge.
Here,
Substitute
The magnitude of
Substitute
Substitute
Conclusion:
The electric field at the distance of
(b)
The electric field at the distance of
(b)

Explanation of Solution
Given:
The magnitude of the two point charges is
The position of the first point charge is at
The position of the third charge is
Formula used:
Write the expression for the superposition of the electric field.
Here,
Assume
Write the expression for the electric field of the first charge.
Here,
Write the expression for the electric field of the second charge.
Here,
Substitute
The magnitude of
Substitute
Calculation:
Substitute
Conclusion:
The electric field at the distance of
(c)
The electric field at the distance of
(c)

Explanation of Solution
Given:
The magnitude of the two point charges is
The position of the first point charge is at
The position of the third charge is
Formula used:
Write the expression for the superposition of the electric field.
Here,
Assume
Write the expression for the electric field of the first charge.
Here,
Write the expression for the electric field of the second charge.
Here,
Substitute
The magnitude of
Substitute
Calculation:
Substitute
Conclusion:
The electric field at the distance of
(d)
The electric field at the distance of
(d)

Explanation of Solution
Given:
The magnitude of the two point charges is
The position of the first point charge is at
The position of the third charge is
Formula used:
Write the expression for the superposition of the electric field.
Here,
Assume
Write the expression for the electric field of the first charge.
Here,
Write the expression for the electric field of the second charge.
Here,
Substitute
The magnitude of
Substitute
Calculation:
Substitute
Conclusion:
The electric field at the distance of
(e)
The position on the x axis where the electric field is zero.
(e)

Explanation of Solution
Given:
Electric field is zero.
Introduction:
Electric field is the region near the charge where the other object will experience a force. The direction of the electric field is in the direction of force. It is basically defined as the electric force per unit charge.
The electric field is zero at the symmetry on the x axis and that is at
Conclusion:
The electric field is zero at the
(f)
The sketch of electric field versus distance.
(f)

Explanation of Solution
Introduction:
Electric field is the region near the charge where the other object will experience a force. The direction of the electric field is in the direction of force. It is basically defined as the electric force per unit charge.
The sketch of the electric field lines and the distance is:
Conclusion:
Thus, the sketch ofelectric field lines and the distance is the curved lines.
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Chapter 21 Solutions
Physics for Scientists and Engineers
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