Question

State formula for work done against electrostatic force while displacing charge +q at

a distance r1 towards charge +Q at a distance​

Answer 1

Answer:

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Explanation:

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Answer 2

Given:

Charges $+q$ and $+Q$ at a distance $r1$ and $r2$

To find:

Work done

Solution:

• The work that should be applied by an external  force to assemble the configuration, is given by the change in potential energy of the system.

• Considering the electrostatic potential between the charges as V

• Work-done to displace a charge q  at a distance r1 $= qV$  

 

Work-done on q to move it against the force of charge Q will be :$W = \frac{1}{4\pi \epsilon _o}\frac{q\times Q}{r1}$

• If the 2 charges are of the same sign, ( as in this case ) then in order to overcome the repulsion caused due to electrostatic force, the sign of work done should also be positive. This happens because the potential energy of the system is also positive.