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Course: Class 12 Physics (India) > Unit 2

Lesson 4: Potential energy of a system of charges
Science
Class 12 Physics (India)
Electrostatic potential and capacitance
Potential energy of a system of charges
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Potential energy of a system of charges (intermediate)

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Problem

Two point charges, q1=−1 C and q2=−2 C, are fixed 4 m apart.
An external agent slowly brings a third charge, q3=2 C, from infinity to the midpoint joining q1 and q2, as shown below.
What is the work done by the external agent in this process?
Note: Write the answer in terms of k, where k=14πϵ0=9×109 VmC.
Choose 1 answer: