Question 1 The Tacoma Narrows Bridge is 1822m long and is constructed of steel. How much longer is the bridge on a warm summer day (99∘F) than on a cold winter day (2∘F)? (NOTE: Careful of your units!) Question 2 Early in the morning, when the temperature is 4∘C, gasoline is pumped into a car’s 40L steel gas […]

## Quiz: Magnetic Forces, Fields, and Induction

Question 1 A 2.47μC particle moves through a region of space where an electric field of magnitude 3911NC points in the positive x direction, and a magnetic field of magnitude 7.53T points in the positive z direction. If the net force acting on the particle is 4.88×10−2N in the positive x direction, find the magnitude of the particle’s velocity. […]

## Sample Test UE, Conductors, Caps

1. Two large metal plates are parallel to each other and separated by 2cm. They are connected to a 120V battery. Assume the plates are in vacuum and the dimensions of the plates are much, much larger than 2cm. (a) Calculate the electric field between the plates. (b) An electron starts from rest and moves from the […]

## Quiz: DC Circuits

Question 1 The lightbulb in the circuit diagram below has a resistance of 1.0 Ω. Consider the potential difference between pairs of points in the figure. a. What are the values of ΔV12, ΔV23, and ΔV34? b. What are the values if the bulb is removed? Question 2 What are the resistances R and the […]

## Quiz: Electric Potential and Potential Energy

Question 1 A uniform electric field of magnitude points in the positive x-direction. (a) Find the change in electric potential between the origin and the point (0, 2.1m). (b) Find the change in electric potential between the origin and the point (2.1m, 0). (c) Find the change in electric potential between the origin and the […]

## Exam 01: Practice Exam

Question 1 (a) Calculate the magnitude of the gravitational force on an electron by a proton that is separated by 1.0m. (b) How far apart would they have to be for the electrostatic force between them to equal your answer to part (a)? Question 2 (a) Calculate the electric field (magnitude and direction) at a distance of 30cm […]

## Quiz: Electric Forces and Fields

Question 1 Two point charges of equal magnitude are 2.6cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 114NC. Find the magnitudes of the two charges. (NOTE: Enter your answer in picocoulombs, pC.) Question 2 Four point charges, each of magnitude are located at the corners […]

## Quiz: The Electric Force

Question 1 Two identical negative charges are located on the y-axis, at y = +4m and y = -4m. A positive charge of 0.25C is placed on the x-axis at x = 2m. What direction does the net force on the proton point? Select one: A. Along the -x-axis B. At a 45 degree angle […]

## Quiz: The Gravitational Force and Field

Question 1 A 10.0 kg bowling ball and a 11.3 kg bowling ball rest on a rack 13.4 m apart. Part A What is the force of gravity exerted on each of the balls by the other ball? Enter your answer in scientific notation, with 4 significant figures. Part B At what separation is the […]