Log in
Physics
1
answer
0
watching
71
views
27 Nov 2019

-Suppose the force between two charged objects separated by adistance r is + 12 N. If their distance apart were doubled, whatwould be the new force and how do you determine if it is attractiveor repulsive?

-Suppose someone calculates a force of -8 N between the two chargedobjects. How can you determine if the charges on the objects areopposite or like?

Watch
1
answer
0
watching
71
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Tod Thiel
Tod ThielLv2
15 Apr 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

1. Iftwo equal charges are separated by a certain distance, the force ofrepulsion is F. Given F1, if each charge inF1 is doubled and the distance is cut in half, what isthe new value of the force of repulsion, F2? Expressyour answer in terms of F1.<?xml:namespace prefix = ons = "urn:schemas-microsoft-com:office:office" />

2. Theelectrical force on a 2-coulomb charge is 60 Newtons (N). What isthe magnitude of the electric field at the place where the chargeis located?

3. Whatis an electric field? How do you determine the magnitude anddirection of the field at a given point?

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 = –240 V, to point B, where the electric potential is VB =–360 V. What is the change in the electric
potential energy?
(a) 1.92×10–17 J (b) 2.04×10–17 J (c) 5.75×10–17 J (d) 8.98×10–17 J(e) 1.05×10–16 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.

I'm going through my kaplan MCAT physics book and one of thequestions goes like this. They show a picture of two circles, onelabeled S and one labeled R, with a force vector extending from Sto R. The question asks:

"If an electron were placed midway between R and S the resultantelectric force on the electron would be:"
A) towards R
B) towards S
C) up
D) down

Due to the fact that the force vector was pointing towards R, Ireasoned that the two circles were unlike charges since they wereattracting each other, but it didn't seem to indicate whether R orS was positive or negative.

The answer at the back of the book says the electron will movetowards S because unlike charges attract and repelled by R becauselike charges repel. How did they deduce that S was positive and Rwas negative? Does it have to do with the fact that the forcevector is pointing away from S and towards R? I didn't think itmattered which direction the force vector was pointing.

Please forgive me if this is obvious, but physics is by far myworst subject for MCAT. I would appreciate your help!

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in