Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - NEET MCQ

Definition based

Definition based

The electric field lines are perpendicular to the equipotential surface. The field lines can not intersect each other because the electric force can not have two directions at a point.

We can generalise it by assuming a positive charge moving away from another positive charge. now both of them are repelling each other with some force. so that positive charge will accelerate which results in the increase in K.E.

Shape of equipotential surfaces for a uniform electric field along x-axis are Planes normal to the field.

Definition based

In moving a small positive charge from Q to P, work has to be done by an external agency against the electric field. Therefore, work done by the field is negative.

Here q₁ = 1.8 μC = 1.8 × 10⁻⁶ C, q₂ = 2.8 μC = 2.8 × 10⁻⁶C

Distance between the two spheres = 40 cm = 0.4 m
For the mid-point r₁ = r₂ = 0.40/2 = 0.2 m Potential at O,

From the figure, potential at P,

Potential at centre O of the square

Work done in shifiting (−Q) charge from centre to infinity