As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge –Q from the point A [co-ordiantes (o, a)] to another point B [co-ordinates(a, o)] along the straigth path AB is:
A
zero
B
C
. 
D
Text Solution
Verified by ExpertsThe correct answer is:
A
The work done in carrying a test charge consists in product of difference of potential at points A and B and value of test charge.
potential at A
V A = 
potential at
V B = 
Thus, work done in carrying a test charge – Q from A to B
w = (V A – V B ) (–Q) = 0
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