Q. A 10cm-long thin glass rod is uniformly charged to +50 nC. A small plastic bead, charged to - 4.7 nC, is 4.5 cm from the center of the rod. What is the magnitude of the force on the bead?
Q. A movig particle encounters an external electric field that decreases its kinetic energy from 9170 eV to 5120 eV as the particle moves from position A to position B. The electric potential at A is -50.0 V, and that at B is +31.0 V. Determine the charge of the particle. Include the algebraic sign (+ or -) with your answer.