⚛️ Physics · Electrostatic Potential and Capacitance · NEET & JEE

Four equal point charges of +2 µC are fixed at the corners of a square of side 0.1 m. The electric potential at the centre of the square is:

Answer: 1.0 10 6 V.

A 1.0 × 106 V
B 2.5 × 105 V
C 5.1 × 105 V
D 7.2 × 105 V

Correct answer: A. 1.0 × 106 V

Explanation: Each corner is r = (0.1√2)/2 = 0.0707 m from the centre. V = 4kq/r = 4 × 9 × 109 × 2 × 10-6/0.0707 ≈ 1.0 × 106 V.

Radial electric field lines and concentric red equipotential lines around a point charge (an electron), with field lines pointing inward

Field lines (radial) and equipotential lines (concentric circles) of a point charge. Equipotential surfaces are always perpendicular to the field lines. Image: Sjlegg, Public Domain, via Wikimedia Commons.

Concept context

Electric potential, equipotential surfaces, potential energy of charge systems, conductors, dielectrics, capacitors, combinations, and energy storage.

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Four equal point charges of +2 &micro;C are fixed at the corners of a square of side 0.1 m. The electric potential at the centre of the square is:

Concept context

More Electrostatic Potential and Capacitance questions

Four equal point charges of +2 µC are fixed at the corners of a square of side 0.1 m. The electric potential at the centre of the square is: