Two point charges are located on $\"image\"$ axis. \ \

\

One point charge is $\"\"$ .

\

First point charge is located at the $\"\"$ .

\

Second point charge is $\"\"$ .

\

First point charge is located at the origin $\"\"$ m.

\

Third point charge of $\"\"$ is placed in between $\"\"$ at $\"\"$

\

Since the point chareges $\"\"$ and $\"\"$ are unlike, they attracts each other.

\

Coulomb\\'s law: $\"\"$ , where $\"\"$ .

\

Find the force on $\"\"$ due to $\"\"$ .

\

$\"\"$

\

Disatance between $\"\"$ and $\"\"$ is $\"\"$

\

Substitute $\"\"$ , $\"\"$ and $\"\"$ in $\"\"$

\

$\"\"$

\

$\"\"$

\

Find the force on $\"\"$ due to $\"\"$ .

\

$\"\"$

\

Disatance between $\"\"$ and $\"\"$ is $\"\"$ .

\

Substitute $\"\"$ , $\"\"$ and $\"\"$ in $\"\"$ .

\

$\"\"$

\

\

$\"\"$ N.

\

This force is also in the direction of left $\"\"$ .

\

Net force on point charge $\"\"$ is $\"\"$ .

\

\

$\"\"$

\

$\"\"$ N.