Question

A charge of +1.9 micro-coulombs lies on a horizontal surface. It has a mass of 3 kg and the coefficient of static friction between it and the surface is 1.78. Another charge of -2.3 micro-coulombs lies on the horizontal surface 9 cm to the right of the charge. A third charge which is negative is located 19 cm above the positive charge on the surface. What is the smallest magnitude this charge needs to be in order for the positive charge to overcome static friction such that the negative charge on the surface begins to move it? Answer in micro-coulombs.

Answer 1

A charge of +1.9 micro-coulombs lies on a horizontal surface

Then q1 is 1.9 micro-coulombs and M is 3 kg

Then I show in figure so easily to know all ..