Calculate the current drawn from the battery by the network of resistors shown in the figure.
How does one explain increase in resistivity of a metal with increase in temperature ?
Why is choke coil needed in the use of fluorescent tubes with ac mains ?
How does one explain increase in resistivity of a metal with increase in temperature ?
Why do the electrostatic field lines not form closed loops ?
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.
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?
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.