Three charges each equal to 2 μC are placed at the corners of an equilateral triangle. If force between any two charges is 2F, then the net force on either will be:
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.
A point charge +Q is placed in the vicinity of a conducting surface. Draw the electric field lines between the surface and the charge.
the magnitude of a charge q at the center of two equal and like charges Q so that the three charges are in equilibrium
A. Q
B. Q/2
C. Q/4
D. –Q/4
Two point charges q1 and q2 are located at points (a, 0, 0) and (0, b, 0) respectively. Find the electric field due to both these charges at the point (0, 0, c).
Two charges q and –3q are placed on x-axis separated by distance d. Where a third charge 2q should be placed such that it will not experience any force ?
Derive an expression for electric field of a dipole at a point on the equatorial plane of the dipole. How does the field vary at large distances?
Write the expression for the drift velocity of charge carriers in a conductor of length l across which a potential difference V is applied.
Why is choke coil needed in the use of fluorescent tubes with ac mains ?
Why do the electric field lines never cross each other ?
Why must electrostatic field at the surface of a charged conductor be normal to the surface at every point ? Give reason.
Draw a graph to show the variation of resistance of a metal wire as a function of its diameter keeping its length and material constant.
Two identical cells, each of emf E, having negligible internal resistance, are connected in parallel with each other across an external resistance R. What is the current through this resistance ?
Define the term mobility of charge carriers in a conductor. Write its S.I. unit.