The electrostatic field due to a charged conductor just outside the conductor is:

1.	zero and parallel to the surface at every point inside the conductor.
2.	zero and is normal to the surface at every point inside the conductor.
3.	parallel to the surface at every point and zero inside the conductor.
4.	normal to the surface at every point and zero inside the conductor.

Four charges are arranged at the corners of a square \(ABCD,\) as shown in the adjoining figure. The force on the positive charge \(Q\) kept at the centre \(O\) is:

A total charge \(Q\) is broken in two parts \(Q_1\) and \(Q_2\) and they are placed at a distance \(R\) from each other. The maximum force of repulsion between them will occur, when:

Two small spheres each having the charge \(+Q\) are suspended by insulating threads of length \(L\) from a hook. If this arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each will be:

1. \(180^\circ,\) \(\dfrac{1}{4 \pi \epsilon_{0}} \dfrac{Q^{2}}{(2 L )^{2}}\)

2. \(90^\circ,\) \(\dfrac{1}{4 \pi \epsilon_{0}} \dfrac{Q^{2}}{(L )^{2}}\)

3. \(180^\circ,\) \(\dfrac{1}{4 \pi \epsilon_{0}} \dfrac{Q^{2}}{2 L ^{2}}\)

4. \(180^\circ,\) \(\dfrac{1}{4 \pi \epsilon_{0}} \dfrac{Q^{2}}{ L ^{2}}\) 

Two charges \(+2\) C and \(+6\) C are repelling each other with a force of \(12\) N. If each charge is given \(-2\) C of charge, then the value of the force will be:

Five balls numbered \(1\) to \(5\) are suspended using separate threads. Pairs \((1, 2), (2, 4),\) and \((4, 1)\) show electrostatic attraction, while pairs \((2, 3)\) and \((4, 5)\) show repulsion. Therefore ball \((1)\) must be:

1. positively charged
2. negatively charged
3. neutral
4. made of metal

Two spherical conductors \(B\) and \(C\) having equal radii and carrying equal charges in them repel each other with a force \(F\) when kept apart at some distance. A third spherical conductor having same radius as that of \(B\) but uncharged is brought in contact with \(B\), then brought in contact with \(C\) and finally removed away from both. The new force of repulsion between \(B\) and \(C\) is:
1. \(\frac{F}{4}\)
2. \(3\frac{F}{4}\)
3. \(\frac{F}{8}\)
4. \(3\frac{F}{8}\)