If a metal sphere has a charge of -4.00 C. The sphere must have an excess of a)2.50E+19 protons b)2.50E+19 electrons c)-4.00 electrons d)-4.00 protons

A proton and an electron are in a constant electric field created by oppositely charged plates. Both charges are halfway between the two plates (and far enough apart that they do not interact with one another). When they are released, which will acquire more kinetic energy, a) the proton, b) the electron, c) neither will move or d) they will both acquire the same kinetic energy.

Can a body have a charge of 4-8 x 10-18 coulomb ? Ans. Yes.

SAQ: A charge is placed at the midpoint of the line joining the system of two equal charges +2Q each. The nature and magnitude of the charge that is placed for the equilibrium of the system is a. a) -Q/2 b. b) Q/4 c. c) -Q/4 d. d) none of the above SAQ: Two charges 6 mC, -2 mCare separated by a distance of1 m in air. The distance of the point between the two charges for zero electric potential is a. a) 0.25 m b. b) 0.67 m c. c) 0.75 m

An Iron ion (Fe+2, with charge of +2e) is a particle with radius of about 1.4 x10-10 meters. What is the magnitude of the electric force between two Iron ions located 1.6 x10-8 meters apart? A.) 1.2 x 10 -8 N B.) 9.0 x 10 -13 N C.) 4.7 x 10 -8 N D.) 3.6 x 10 -12 N E.) 1.4 x 10 26 N