Concept explainers
(a)
The electric potential at a point due to two charges.
(a)
Answer to Problem 27P
The electric potential at points
Explanation of Solution
The side of the square is
Write the expression for potential at the point due to two point charges.
Here,
Substitute
Thus, the electric potential at
Substitute
Thus, the electric potential at
(b)
The potential difference in travelling from
(b)
Answer to Problem 27P
The potential difference is
Explanation of Solution
Write the expression for potential difference
Here,
Substitute
Thus, the potential difference is
(c)
The work done by an external force in moving a charge from
(c)
Answer to Problem 27P
The work done is
Explanation of Solution
The charge being moved is
Write the expression for work done in moving a charge from
Here,
Write the expression for
Here,
Substitute (IV) in (III)
Substitute
Thus, the work done is
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