TEST CONDUCTED ON 10/04/2016

1-  Calculate Coulomb force between two α- particles separated by a distance of 3.2 X 10^-15m in air. [3]

2-  Compare the electrostatic and gravitational forces.[2]

3-  State coulomb law and write its vector expression to show that Coulomb force is Newtonian in nature. [3]

4-  State principle of superposition for forces between multiple charges and find expression for it. [3]

5-   Consider three charges q1, q2 & q3 each equal to q at the vertices of an equilateral triangle of side of l. what is the force on a charge Q placed at the centroid of the triangle. [3]

OR

6-   Consider the charges q, q and –q placed at the    vertices of an equilateral triangle. What is the force on each charge?