Read before you solve · 3 min

Read Field Graphs: Check Both Ends and the Midpoint

This short read prepares one exact NSEP pattern: electric-field plot between equal charges. Identify the physical condition before calculating.

NSEP · Electrostatics · 1 linked question · 100% coverage

Know this first

Electricity questions depend on identifying charge, a conducting path and the condition that controls current or magnetic effect.

Current · Flow of electric chargeCircuit · A complete conducting loopResistance · Opposition to current

Study deeper: NCERT Physics · Electrostatics

Start with the physical model

Read the configuration once, state the conserved quantity or governing law, and mark any changing geometry, sign convention or limiting condition.

At a point x between the charges, taking +x to the right, E(x)=kQ/x2 - kQ/(L-x)2.

As x\rightarrow 0+, E\rightarrow +∞;

at x = L/2, E=0;

and as x→L-, E→-∞.

The function decreases continuously through zero at the midpoint. Therefore the correct qualitative plot is Fig. d.

Check units, sign and one limiting case. A valid result must still fit the original geometry and stated constraint.

OlympIQ trap

Potential is symmetric here, but the electric field changes sign at the midpoint.

100% coverage across the linked question.