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 neg ...continues

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.

circuit

For each of the following circuits, determine how the brightness of the bulbs change when the switch is closed. Please see attachment

Physics III Problem

A 10 mF capacitor is placed in a series circuit with a 100 Kohm resistor, a switch, and a 10V battery. a. What is the RC time constant in s? b. What is the initial current when the switch is closed in mA? c. What is the charge on the capacitor at t=RC in C? d. What is the voltage drop across the resistor when t=RC in A?

power lines and magnetic fields

A power line is 3.5m off the ground and is carrying 75 amps. A man standing under the power line is holding a compass 1.25m off the ground. 1) how large is the magnetic field produced on the compass by the power line? 2) if the power line runs east and west, how does its magnetic field affect the direction in which the com ...continues

Algebra/Physics

A power line is 3.5m off the ground and is carrying 75 amps. A man standing under the power line is holding a compass 1.25m off the ground. 1) how large is the magnetic field produced on the compass by the power line? 2) if the power line runs east and west, how does its magnetic field affect the direction in which the compass p ...continues

Algebra/Physics

A 5 meter long copper wire, with a cross sectional area of 1.0mm^2 is bent into a circle. This loop of wire is mounted in a vertical plane between the poles of a magnet. This magnet is aligned so that its field points in a horizontal direction from the west to the east; the magnitude of this field is 7.25*10^(-4)T. The loop of w ...continues