Look at the attractive and repulsive forces given in Fig. A and find out what would be the charge on the bobs.

When a charged metal sphere of +10 charges is connected to a neutral body, what would be the charge on both the bodies after connecting (Fig. B)? Which principle helped you to come to the reasoning? In which direction would the charges flow? a to b or b to a? Why?

Two sphereical bodies, each of mass 50 kg, are placed at a separation of 20 cm. Equal charges are placed on the bodies and it is found that the force of Coulomb repulsion equals the grativational attraction in magnitude. Find the magnitude of the charge placed on either body.

Look at the three tuning forks given in Figure B. The longest is I, the middle one is II, and the shortest is III. Looking at the length find out which one has a higher pitch than the others.

A: Gravitational force is always attractive but electromagnetic force can be attractive or repulsive: R : Mass comes only in one variety (there is no negative mass) but charge comes in two varieties. (Positive and negative charge)

The attractive force between oppositely charged ions that holds ions together is called an _______ bond.

In Fig., find the resultant magnetic force and torque about C.

Three equal charge q_(0) each are placed at three corners of an equilateral triangle of side 'a'. Find out force acting on one of the charge due to other two charges ?

Assume that there is no repulsive force between the electrons in an atom but the force between positive and negative charges is given by Coulomb's law as usual . Under such circumtences, calculate the ground state energy of a He-atom.

In Fig. C, what would be the charge on the rod and the sphere after touching. In which direction would the charges flow: from the rod to the sphere or from the sphere to the rod? Why?

By simply looking at the pair of angles given in Fig., state which of the angles in each of the pairs is greater: