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Consider a group of charges q₁, q₂, q₃ ... such that Σq ≠ 0. Then equipotentials at a large distance, due to this group are approximately :
Draw equipotential surfaces for an electric dipole.
Two long straight thin wires AB and CD have linear charge densities 10 μC/m and −20 μC/m, respectively. They are kept parallel to each other at a distance 1 m. Find the magnitude and direction of the net electric field at a point midway between them.
The work done by an external agent in moving a unit positive test charge from one point to another along an equipotential surface in an electric field is:
Two charges 2 mC and –2 mC are placed at points A and B 6 cm apart.
A uniform electric field pointing in positive x-direction exists in a region. Let A be the origin, B be the point on the x-axis at x = + 1 cm and C be the point on the y-axis at y = + 1 cm. Then, the potentials at the points A, B and C satisfy
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