test prep questions

Physics test prep questions

Physics III Problem

The surface charge density of an infinite sheet of charge is 9.00 X 10^-6 C/M^2. What is the magnitude of electric field near the center of the sheet? Possible Ans- A) 0 N/C B) 2.56 kN/C C) 708 kN/C D) 508 kN/C

Physics III Problem

Two identical small chargerd spheres, each having a mass of 3X10^-2kg, hang at equilbrium. The length of the string is .2m, the angle between each string and the perpendicular is 10 degress. A=.034M A) What is the tension in the string B) Eletric force felt by each sphere C) Charge of each sphere D) If the spheres were negatively charged, how many more electrons than protons does each have?

Mixed Circuits

A1. Find the current through and potential difference across each resistor in the following circuit.

Mixed Circuit

Find all the currents and potential differences in the following circuit.