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 ?
Why are electric field lines perpendicular at a point on an equipotential surface of a conductor ?
Two point charges q and –2q are kept d distance apart. Find the location of the point relative to charge q at which potential due to this system of charges is zero.
Obtain the expression for the potential due to an electric dipole of dipole moment p at a point ‘d’ on the axial line.
The electric potential due to point charge 3 nC at distance of 9 cm is
(a) 270 v
(b) 3 v
(c) 300 v
(d) 30 v
Show variation of resistivity of copper as a function of temperature in a graph.
State which of the two a capacitor or an inductor, tends to become SHORT when the frequency of the applied alternating voltage has a high value.
Figure shows a point charge + Q, located at a distance R/2 from the centre of a spherical metal shell. Draw the electric field lines for the given system.
Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more ? Justify your answer.
Why do the electric field lines never cross each other ?
Two point charges ‘q1’ and ‘q2’ are placed at a distance ‘d’ apart as shown in the figure. The electric field intensity is zero at a point ‘P’ on the line joining them as shown. Write two conclusions that you can draw from this.
Why do the electrostatic field lines not form closed loops ?