A negatively charged object X is repelled by another charged object Y. However an object Z is attracted to object Y. Which of the following is the most possibility for the object Z?

In an experiment three microscopic latex spheres are sprayed into a chamber and became charged with charges +3e, +5e and $$-$$3e respectively. All the three spheres came in contact simultaneously for a moment and got separated. Which one of the following are possible values for the final charge on the spheres?

An object has charge of 1 C and gains 5.0 $$\times$$ 10¹⁸ electrons. The net charge on the object becomes -

The electric potential V at any point (x, y, z) is given by V = 3x² where x is in metres and V in volts. The electric field at the point (1 m, 0, 2m) is -