Three charges `-q_1`, `+q_2` and `-q_3` are placed as shown in the figure. The x-component of the force on `-q_1` is proportional to

The value of charge q_1 ,q_2 and q_3 as shown in the figure are

Assertion: Two charges q_(1) and q_(2) are placed at separation r . Then magnitude of the force on each charge is F . Reason: Now a third charge q_(3) is placed near q_(1) and q_(2) . Then force on q_(1) and q_(2) remains F .

Three point electric charges q_1 = 6µC, q_2 = 4µC and q_3 = -8µC are placed on the circumference of a circle of radius 1m as shown in the figure. What is the value of the charge q, placed on the circle if the potential at the centre of the circle is zero?