/. An unknown charge experiences a force (2.10 UN) opposite to the direction of the electric field (7.00 10'N/C). Determine the magnitude and identify the type of charge (in C). 2. 10 UN 3.00 * 10 -12 C 7 x106 N by induction 8. A pith ball has a charge of +1.00 pC. a. Determine the number and type of charges which must be removed from the pith ball in order to have that charge. b. Determine the electric field (in N/C) at a distance of 2.00cm away from the charged pith ball. 9= 1.00 x 10 -12 C a ) v = 2. 00 x10 2 m E = kq b ) = (22. 48 N/C ) is the electric feild of a charged pith ball Zcm away. 9. Two charges are 1.50m apart. The left charge is -4.00uC and the right charge is +3.00HC. Determine the net electric field (in N/C) exactly half way in between the charges. L - 4:OO UC 1.50 m Enet = ELTER + 3,00 UC 1. 12 x10 N / C ER = HER = 6. 40 x10 N/ C = 4. 80 y 10 N/L 10. Two point charges repel each other with a force of 400UN when they are 30.0cm apart. a. Determine the new force between them if the distance is changed to 15.0cm. b. If the charges are equal, determine the magnitude of each charge (in C)