JEE Main · 2026 · 21 Jan 2026 · Shift 1 · Electrostatics

The force is $F=-\frac{dV}{dx}$, so its magnitude equals the steepness of the $V$–$x$ graph in each region. Region $BC$ rises from $1$ to $4$ over one unit, the steepest; $AB$ rises from $0$ to $1$ over one unit; $DE$ falls from $4$ to $3$ over two units; and $CD$ is flat with zero slope. Ranking the magnitudes from high to low gives $F_{BC}>F_{AB}>F_{DE}>F_{CD}$.