1) A object is massaged with fur until it begins to develop a -4 coulomb charge. How many extra electrons did the fur transfer to the object?

2) Evaluate the force between point charges 9.5 mC and 6.4 mC divided by 2.33 cm in the atmosphere.

3) Three-point charges have been made in a straight line. A 7.9 micro coulomb point charge is to the left of a 1.4 micro coulomb charge, which is to the left of a -8.5 micro coulomb charge. Each consecutive charge pair is separated by 7 cm. Calculate the magnitude and direction of the force acting on the middle charge. After the units, including the direction (left or right).

4)A dipole is composed of two identical and opposite charges that are distanced by a given distance. The magnitude of the charges in this type of dipole is 3.8C, and the separation of the charges is 8.1 mm. Determine the electric field strength at the distance of 6.2mm all along the perpendicular line that bisects the charges.