Obtain an expression for the potential energy due to a collection of three point charges which are separated b

III. Long Answer Questions · Q8

Q. Obtain an expression for the potential energy due to a collection of three point charges which are separated by finite distances.

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Step 1. Bring in $q_1$ . With no other charges yet present, bringing $q_1$ in from infinity costs zero work.

Step 2. Bring in $q_2$ . Against the field of $q_1$ alone, the work needed is $W_2=kq_1q_2/r_{12}$ .

Step 3. Bring in $q_3$ . Against the combined field of both $q_1$ and $q_2$ already in place, the work needed is $W_3=kq_1q_3/r_{13}+kq_2q_3/r_{23}$ . …

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Q.Obtain an expression for the potential energy due to a collection of three point charges which are separated by finite distances.

Concept understanding — Electrostatic Potential Energy of a Point-Charge System

Q.Obtain an expression for the potential energy due to a collection of three point charges which are separated by finite distances.

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