Keplers’s Laws of Planetary Motion, Kepler's Law, Law of Orbits, Law of Areas, Law of periods

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  Keplers’s Laws of Planetary Motion: 1 st law ( Law of Orbits ): Every planet moves around the sun in elliptical orbit with the sun at one of the foci of the elliptical orbit. 2 nd   law ( Law of Areas): The line joining the planet to the sun sweeps over equal areas in equal intervals of time.                                                             Area of SAB = Area of SCD  2 nd   law tells us that a planet does not move with constant speed around the sun. It speeds up while approaching the nearest point called ‘ perigee’ and slows downs while approaching the farthest point called ‘ apogee’. therefore, distance covered on the orbit with in the given interval of time at perigee is greater than that at apogee such that areas swept are equal. 3 rd Law ( Law of periods): The square of the time periods of revolution of...
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Expression for Electric Field intensity

In this article, we will rigorously derive expressions for the Electric Field due to Point Charge.

Electric Field due to a Point Charge:

Suppose a point charge/ Source charge q is palced at point O. 
This charge exerts force F on test charge q0, which is palced at a distance r from it.

From Coulomb's Law


By the definition of  Electric Field Intensity 


Coulomb's Law value substitute in intensity of electric field


Electric Field Intensity formula is N/C

Where:

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