Two equal and opposite charges are placed at points with coordinates $x=0$, $y=a$ and $x=0$, $y=-a$ as shown in the diagram.

Find the electric field at the point with coordinates $x=d, y=0$.

 

Two equal and opposite charges are placed at points with coordinates $x=0$, $y=a$ and $x=0$, $y=-a$ as shown in the diagram.

Find the electric field at the point with coordinates $x=d, y=0$. for two equal negative charges $-q$ on the $y-$axis.

Two equal and opposite charges are placed at points with coordinates $x=0$, $y=a$ and $x=0$, $y=-a$ as shown in the diagram.

Sketch the graph to show the variation of these fields with the distance $d$.

Show by applying Newton,s law of gravitation and the second law of motion that a satellite (or planet) in a circular orbit of radius $\mathrm{R}$ around the earth (or the sun)has a period (time for one complete revolution) given by

${\mathrm{T}}^2=\frac{4{\mathrm{\pi }}^2{\mathrm{R}}^3}{\mathrm{GM}}$

 Where $\mathrm{M}$= mass of attracting body(earth or Sun). This is Kepler's third law.