PHY 1200 Study Guide - Midterm Guide: Electric Flux, Net Force, Multiple Choice

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turquoisegnu128

9 Jan 2019

School

Northeastern University

Department

Physics

Course

PHY 1200

Professor

All

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Physics ii exam 1 155 points name _______________ discussion day/time_______________ Multiple choice: for full credit, circle only the correct answer. For half credit, circle the correct answer and one incorrect answer. For credit, circle the correct answer and two incorrrect answers: two small spheres repel one another electrostatically. The net force on charge +q due to the other two charges is: vertically up, vertically down, zero, horizontal to the left, horizontal to the right. Q: a positive charge is brought close to a fixed neutral conductor that has a cavity. The cavity is neutral; that is, there is no net charge in the cavity. Which of the figures best represents the charge distribution on the inner and outer walls of the conductor: 1, 2, 3, 4, 5. 3: a long box of length l, width w, and height h contains a line of positive charge density + .

Related Questions

An uncharged conductor has a hollow cavity inside of it. Within this cavity, there is a charge of +10μC that does not touch the conductor. There are no other charges in the vicinity. Which statement about this conductor is true? (There may be more than one correct choice.)

a. The outer surface of the conductor contains+10μC of charges and the inner surface contains-10μC.

b. The net electric field within the material of the conductor points away from the +10μC charge.

c. The inner surface of the conductor carries a charge of -10μC and its outer surface carries no excess charge.

d. Both surfaces of the conductor carry no excess charge because the conductor is uncharged.

e. The inner and outer surfaces of the conductor each contain charges of -5μC.

salmonwalrus329

1.Two uncharged, conducting spheres, A and B, are held at rest oninsulating stands and are in contact. A positively charged rod isbrought near sphere A. While the rod is in place, the two spheresare separated. How will the spheres be charged, if at all, afterthey are separated?
Sphere A Sphere B
(a) positive positive
(b) positive negative
(c) negative positive
(d) negative negative
(e) zero zero

2. A charged conductor is brought near an uncharged insulator.Which one of the following statements is true?
(a) Both objects will repel each other.
(b) Both objects will attract each other.
(c) Neither object exerts an electrical force on the other.
(d) The objects will repel each other only if the conductor has anegative charge.
(e) The objects will attract each other only if the conductor has apositive charge.

3. An electron is moved from point A, where the electric potentialis VA = â240 V, to point B, where the electric potential is VB =â360 V. What is the change in the electric
potential energy?
(a) 1.92Ã10â17 J (b) 2.04Ã10â17 J (c) 5.75Ã10â17 J (d) 8.98Ã10â17 J(e) 1.05Ã10â16 J

4. A -2q charge is located a distance d to the right of a +4qcharge, along the x
axis. At which point (or points) along the axis does the electricfield go to zero? To
solve this problem, consider an observer at point P, which is anarbitrary distance x from the +4q charge. Find the value (orvalues) for x (in terms of the separation distance d) where thetotal electric field vanishes.
(a) The electric field is never zero in the vicinity of thesecharges.
(b) The electric field is zero at x = -0.328d.
(c) The electric field is zero at x = +4.22d.
(d) The electric field is zero at both x = -2.26d and x =+2.26d.
(e) The electric field is zero at x = +3.41d.

5. point A is a distance L away from a point charge Q. Point B is adistance 4L away from Q. What is the ratio of the electrostaticpotential at B to that at A, i.e., what is VB/VA?
(a) 1/16
(b) 1/9
(c) 1/4
(d) 1/3
(e) can not be determined without specifying Q and L

6. Which one of the following statements best explains why it ispossible to define an electric potential
in a region of space that contains an electric field?
(a) Work must be done to bring two positive charges closertogether.
(b) Like charges repel one another and unlike charges attract oneanother.
(c) A positive charge will gain kinetic energy as it approaches anegative charge.
(d) The work required to bring two charges together is independentof the path taken.
(e) A negative charge will gain kinetic energy as it moves awayfrom another negative charge.

1. two curved plastic rods, one of charge +q = 1.10Ã10-5 C and theother of charge -q, form a circle of radius R = 0.26 m in an xyplane. The x axis passes through their connecting points, and thecharge is distributed uniformly on both rods. What are themagnitude and direction of the electric field E produced at P, thecenter of the circle? Answer for both E, x component and E,ycomponent.

PHY 1200 Study Guide - Midterm Guide: Electric Flux, Net Force, Multiple Choice

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