
Concept explainers
(a)
The position
(a)

Explanation of Solution
Introduction:
The electric field is the region near the charge where the other object or body will experience the force. The field lines are away from the positive charge and go towards the negative charge.
Draw the representation of the position of the three charges.
Write the expression for the Pythagoras theorem to the above triangle.
Here,
Substitute
Solve the above equation for
Write the expression for the angle.
Substitute
Solve the above equation for
Conclusion:
Thus, the value ofposition
(b)
The electric field.
(b)

Explanation of Solution
Introduction:
The electric field is the region near the charge where the other object or body will experience the force. The field lines are away from the positive charge and go towards the negative charge.
Write the expression for the net electric field at point
Here,
Write the expression for the electric field due to the second charge.
Here,
Substitute
Write the expression for the electric field due to the third charge.
Here,
Substitute
Write the expression for the electric field due to the third charge.
Here,
Substitute
Substitute
Conclusion:
Thus, the value of electric field is
(c)
The electric field is same at
(c)

Explanation of Solution
Formula used:
Write the expression for the electric field at point
Calculation:
Substitute
Substitute
Conclusion:
Thus, the electric field is zero.
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Chapter 21 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
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