Two small, identical spherical conductors carry charges of 7.7 C and 5.0 C. They

Question

Two small, identical spherical conductors carry charges of 7.7 C and 5.0 C. They are separated by a distance of 102.0 cm. Calculate the magnitude of the electrostatic force between these two spheres. Is the force between the spheres in the above problem attractive or repulsive? (Enter A for attractive or R for repulsive -- 1 attempt ONLY)

The spheres described in the previous problem are brought into contact and then returned to their original separation. Calculate the magnitude of the electrostatic force between these two spheres. Is the force between the spheres in the above problem attractive or repulsive? (Enter A for attractive or R for repulsive -- 1 attempt ONLY)

Explanation / Answer

F= k q1q2/r2

F = 9x109 (7.7x10-6 x 5 x10-6) / (1.02)2

F = 0.333N

Repulsive force

In this case charges will exchange and get neutral.

So 7.7 + 5 =6.35 on each

now the force is F = k q1 q2/ r2

plug in the values

repulsive

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