Electromagnetic Theory

1.       Where will be the null point if two positive charges are separated by a distance ?
A- It will be in the line joining them.

2.       Arrange the following forces in descending order of their strengths -
Electromagnetic , Nuclear, Gravitational, Radioactive Decay
A- 2-1-4-3

3.       Distribution of charge around the surface of a Charged Metal Sphere and thin Circular Plate will be ?
A- Uniform and Bulging respectively

4.       Where do the charges reside between a hollow and solid metal sphere?
A- On the outer surfaces in both of them

5.       What is the Unit of Electric field strength E?
A- Volts/meter , newton/coulomb, joule per coulomb meter.

6.       What is the relation between the E and distance in a dipole?
A-  Inversely as cube of the distance

7.       What does the relation between the Electrical Polarization and Susceptibility Indicate?
A- That both are proportional

8.       A charge A of 20 units is there and another B of 5 units, where will be the null point located ?
A- at AN=2BN

9.       Two infinite and parallel metal plates are there and charged with equal surface density and the same polarity. What will be the E in the gaps between the plates?

A-Zero

10.   Why the lightning arrester on the top of the building is is made into a pointed spike?
A- so that the charge per unit area becomes very high for lightening to discharge.

Electromagnetic Theory

1.       The Surface Integra of Electrical Field intensity is
A – Net flux from the surface.

2.       What is the value of the total flux Coming out of a closed surface

A-     Equals total charge enclosed by the surface.

3.       What will be the Electric Field inside a hollow Conducting Sphere?

A-     Zero

4.       The Electric Field inside a Perfectly Conducting Media is ?

A-     Zero

5.       The Electric field Intensity at any point situated at a distance D from a straight charged conductor is proportional to.

A-     1/D