Answer:
The test charge will move to the left side after being released.
Explanation:
Given that,
Test charge = q
First charge = Q
Second charge = 2Q
Distance of point charge from first charge = r
Distance of point charge from second charge = 2r
Let the charge Q placed at left side and charge 2Q placed at right side.
We need to calculate the force due to first charge
Using formula of force

Put the value into the formula
...(I)
We need to calculate the force due to second charge
Using formula of force
...(I)
Divided equation (I) by equation (II)



Hence,The test charge will move to the left side after being released.