What if it wasn’t?

She re-derived the force including a finite conductivity σ. The algebra turned monstrous—integrals of retarded potentials, surface currents, Ohmic losses. But halfway through the third page, a small term survived: a transient repulsive kick that decayed like e^{-σ t/ε₀}. For any real metal, it was negligible. For a perfect conductor (σ → ∞), it vanished.

At the bottom of page 342, just after the line “Thus the force is purely attractive and independent of sign of q,” she paused.

To prove that even in a textbook solved by millions, nature still hides a spark.

She’d skipped a term. A term involving the second derivative of the potential—a term that, for a perfect conductor, should cancel exactly. But her cancellation required the sphere to be infinitely conducting. Perfectly rigid in its response.

Her hands trembled. She turned to the front matter of the Satya Prakash. In the preface, the author had written a line she’d always ignored: “The student will note that the method of images assumes instantaneous rearrangement of surface charge. The physical implications of this assumption are left as an exercise to the thoughtful reader.”

She smiled. Tomorrow, she’d show Vikram. Not to prove him wrong.