A point charge Q is placed at point ‘O’ as shown in figure. Is the potential at point A, i.e., , greater, smaller or equal to potential, at point B, when Q is (i) positive, and (ii) negative charge?
Does the charge given to a metallic sphere depend on whether it is hollow or solid?
What is the geometrical shape of equipotential surfaces due to an isolated charge ?
Why are electric field lines perpendicular at a point on an equipotential surface of a conductor ?
For any charge configuration, equipotential surface through a point is normal to the electric field. Justify.
Why must electrostatic field at the surface of a charged conductor be normal to the surface at every point ? Give reason.
A point charge +Q is placed at point O as shown in the figure. Is the potential difference – positive, negative or zero ?
A charge ‘q’ is moved from a point A above a dipole of dipole moment ‘p’ to a point B below the dipole in equatorial plane without acceleration. Find the work done in the process.
Figure shows the field lines due to a positive charge. Is the work done by the field in moving a small positive charge from Q to P, positive or negative? Give reason.
In the given figure, charge +Q is placed at the centre of a dotted circle. Work done in taking another charge +q from A to B is W₁ and from B to C is W₂. Which one of the following is correct ?
i) W₁ > W₂
(ii) W₁ = W₂
(iii) W₁ < W₂
What is the amount of work done in moving a point charge around a circular arc of radius r at the center where another point charge is located ?
An electron is accelerated through a potential difference V. Write the expression for its final speed, if it was initially at rest.
Write two properties of equipotential surfaces. Depict equipotential surfaces due to an isolated point charge. Why do the equipotential surfaces get closer as the distance between the equipotential surfaces and the source charge decreases ?
Calculate the amount of work done to dissociate a system of three charges 1 mC, 1 mC and – 4 mC placed on the vertices of an equilateral triangle of side 10 cm.
Draw a plot showing the variation of (i) electric field (E) and (ii) electric potential (V) with distance r due to a point charge Q.