Electrostatics ...

A charge QµC is placed at the centre of a cube, the flux coming out from any surface will be

Work done in placing a charge of 8 × 10^–18 C on a condenser of capacity 100 microfarad is

Three capacitors, each of capacity 4µF are to be connected in such a way that the effective capacitance is 6 µF. This can be done by

Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon, such that the electric field at O is double the electric field when only one positive charge of same magnitude is placed at R. Which of the following arrangement of charges is possible for P, Q, R, S, T and U respectively?

As per Fig., a point charge +q is placed at the origin O. Work done in taking another point charge – Q from the point A [coordinates (0, a)] to another point B [coordinates (a, 0)] along the straight path AB is:

Two point charges +8 q and – 2 q are located at x = 0 and x = L respectively. The location of a point on the x axis at which the net electric field due to these two point charges is zero is

Fig. shows four plates each of area A and separated from one another by a distance d. What is the capacitance between P and Q?

A number of condensers, each of the capacitance 1µF and each one of which gets punctured if a potential difference just exceeding 500 V is applied, are provided. An arrangement suitable for giving capacitance of 2µF across which 3000 volt may be applied requires at least

In the circuit shown in Fig., O is connected to point A to charge the capacitor 4 µF. Now, the connection of O is switched to B. The charge on the 4µF capacitor thereby changes by a factor