A small glass ball rubbed with silk gains a charge of +2.0 μC. The glass ball is placed 12 cm from a small charged rubber ball that carries a charge of −3.5 μC. a. What is the magnitude of the electric force between the two balls? b. Is this force attractive or repulsive? c. How many electrons has the glass ball lost in the rubbing process?

(A) The magnitude of force is 4.375 N

(B) Force is attractive

(C) The electron lost in rubbing process is

Explanation:

Given:

Slik gain charge

Glass ball charge

Separation between two charge m

(A)

From the coulomb's law,

Where

N

But magnitude of force is given by,

N

(B)

Here, force is attractive because positive charge attract negative charge

(C)

The electron lost in rubbing process is

Therefore, the electron lost in rubbing process is and magnitude of force is 4.375 N and force is attractive.

real, smaller and upside-down.   so the answer should be b.

0.19 m/s and 0.45 m/s