Two concentric metal spheres have radii r_1 = 10 cm and r_2 = 10.5 cm. The inner sphere has a charge of Q = 5 nC spread uniformly on its surface, and the outer sphere has charge -Q on its surface. (a) calculate the total energy stored in the electric field inside the spheres Hint: You can treat...
Homework Statement
Two hollow concentric conducting spheres hold charges Q[1] and Q[2] as shown in the attachment.
Find the potential of each sphere, and the potential difference.
Homework Equations
Potential difference V = Phi[2] - Phi[1]
The Attempt at a Solution
I'm having...
1. 3 conducting spheres of radius a, b, c (a<b<c) are held at a potential of 0, V, 0 respectively. What is the capacitance of the system?
2. Q=CV (which I assume extends to Qi=CijVj for multiple conductors).
3. I've calculated the fields in the two interesting regions, calculated the charge on...
I am trying to correctly understand the following problem:
Here is the setup:
I have two conducting spherical shells. We will call them S-Left and S-Right. Both spherical shells are initially grounded, therefore, they have no net charge w.r.t. Earth. S-Right is hanging from a string. S-Left...
Homework Statement
Two identical conduction spheres are placed with their centers 0.30m apart. One is given a charge of 12 x 10 ^-9 C, the other a charge of -18 x 10 ^-9 C a) Find the electrostatic force exerted on one sphere by the other. b) The spheres are connected by a conducting wire...
Homework Statement
A sphere of radius 8.0 cm carries a uniform volume charge density rho = 500*10^-9 C/m^3. What is the electric field at r = 3.0 cm?
a.36.0 N/C
b.230 N/C
c.140 N/C
d.565 N/C
e.450 N/C
Homework Equations
E = (k*Q*r)/(R^3), where...
Homework Statement
Four 1.0 g spheres are released simultaneously and allowed to move away from each other. What is the speed of each sphere when they are very far apart?
The Attempt at a Solution
Here's what I got initial potential energy is equal to final kinetic energy.
0.9866...
Homework Statement
Consider the following configuration of fixed, uniformly charged spheres on an xy coordinate system:
·a blue sphere fixed at the origin with positive charge q.
·a red sphere fixed at the point (d1,0) with unknown charge q_red,
·a yellow sphere fixed at the point...
One of my students Chris wanted to ask this question: are atoms perfect spheres? I could have offered one of my own answers to this but I think he would prefer to hear what you guys have to say. The only thing I would say is that I like the question because of its apparent simplicity. I...
Homework Statement
if you guys have trouble reading that, it says,
Suppose you make napkin rings by drilling holes with different diameters through two wooden balls (which also have different diameters). You discover that both napkin rings have the same height h, as shown in the figure...
Hi,
I am doing a project involving spherical wheels. I need some help with regards to the role played by friction on motion of spheres and cylinders (normal car wheels) on roads. Will friction act forward or backwards ?? Which type of wheel would be more advantageous ? Would appreciate any...
Ive got this one homework problem that i am totally clueless on. Any help?
"Two insulating spheres having radii 0.34 cm and 0.54 cm, masses 0.13kg and 0.58 kg, and charges -3x10^-6 C and 2x10^-6 C are released from rest when their centers are separated by 1.2m.
How fast is the smaller sphere...
I have heard of such idea:
A sphere of fractional dimension 0<s<1 is understood as a probability sphere with probability s to have an electron at a certain position
for example the volume of the sphere S^{n-1} in \Re^n has volume
Vol(S^{n-1})= (2\Pi^{n/2})/(\Gamma(n/2)
and we can...
Hi all,
I've got this problem:
Consider the points P such that the distance from P to A(-1,5,3) is twice the distance from P to B(6,2,-2). Show that the set of all such points is a sphere, and find its center and radius.
I think the setup should be this:
sqrt[(x+1)^2 + (y-5)^2 +...
Problem:
An insulated spherical conductor of radius r1 carries a charge Q. A second conducting sphere of radius r2 and initially uncharged is then connected to the first by a long conducting wire. After the connection, what can you say about the electric potential of each sphere? How much...
It's been awhile since I've had physics I, so this problem is giving me a headache.
Q) Two very small conducting spheres, each of a mass 1.0 \times 10^{-4}\,\,(kg) , are suspended at a common point by very thin nonconducting threads of a length 0.2 \,\,(m) . A charge Q is placed on each...
I have two problems that confuse me for similar reasons. The first one:
Find the potential \varphi of an uncharged conducting sphere outside of which a point charge q is located at a distance l from the sphere's center.
The second one:
A system consists of two concentric conducting spheres...
1)Two small equally charged spheres, each of mass m, are suspended from the same point by silk threads of length l.The distance between the spheres x<<l.Find the rate dq/dt with which the charge leaks off each sphere if their approach velocity varies as v=a/(x)^0.5, a is a constant...
Three identically charged spheres A, B, and C, each with a charge of +3.0 * 10-7 C, are located at the corners of a triangle whose sides are 30 cm long and all the angles are 60 deg. What is the net force acting on sphere A?
I figured the X coordinates cancel each other out. For the Y...
Sir,
1) Two spheres of different materials, one with double the radius and 1/4th wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the large sphere is 25 minutes and that in smaller sphere is 16 minutes, what is the ratio of the thermal...
Hi,
I have a physics problem I need to solve which I think is quite straight forward but would appreciate some input on whether I'm going down the right lines
Tow metal spheres hanging from the roof one of 10g (ball1) and one of 100g (ball2)
ball1 is falling from a height of 15cm...
Follow up on the 2 spheres capacitor problem. Help needed before tomorrow!
It was probably a bit hard to see what the old topic was about, so I started a new one. I'm still not quite sure on this problem, so I'd REALLY appreciate it if somebody could clear things up a little bit more. The...
The question is the following one:
Two isolated conducting spheres of equal radius have charges +Q (#1)and -Q (#2) respectively. If they are separated by a large distance compared to their radius, what is the capacitance of this unusual capacitor?
The first remark :wink: : C= \frac{Q}{V}...
The question i am stuck on and am unable to find anything in my notes about (although i can't find my notes from tuesday however we seem to have covered the topic on friday and maybe just not finished it off in time) is ...
Two isolated spherical conductors one with radius R and one with...
Two small silver spheres, each with a mass of 12.0 g, are separated by 1.00 m. Calculate the fraction of the electrons in one sphere that must be transferred to the other to produce an attractive force of 3.00e4 N (about 3 tons) between the spheres. (The number of electrons per atom of silver is...
I am studying for my exam for physics and i came across 2 questions that i sort of need help with.
1. Two identical spheres, with charges of Qa=-2Q and Qb=1Q, attract one another with a force of 9.0 x 10^-4 N. A third identical uncharged sphere C touches B and now C is completely removed from...
hi,
this is a great forum here and i was wondering if anyone could lend a helping hand , it would be great.
im currently studying at univercity for electronics engineering and have been given some physics questions to work onover the holidays. I ahve spend quite some time on this question...
Any help on this question is appreciated.
Two small spheres each of mass m are suspended by light strings of light L. A uniform electric field is applied in the x direction. If the spheres have equal and opposite charges of magnitude Q, determine the electric field intensity that enables the...
Hello everyone, I managed to get Parts (a) and (b) of this problem but can't get the last for some reason. A metal sphere of radius 15cm has a net charge of 2.0E-8C. THe question is, at what distance from the sphere's surface has the electric potential decrased by 700V? Well i found the...
the below figure make small angles theta1 and theta2 with the vertical.
Figure 21-50
(a) If Q1 = Q, Q2 = 3Q, and m1 = m2 = m, determine the ratio theta1 / theta2.
(b) If Q1 = Q, Q2 = 2Q, and m1 = m, and m2 = 4m, determine the ratio of theta 1 / theta 2.
I don't get the forces that are...
My question is regarding finding volume and densities of spheres. I'm getting strange results, so I thought I'd find out where my methods are incorrect.
I am using a graduated cylinder to drop the spheres into with water inside. I measured the initial volume of the water before I dropped...
I have homework, the teacher gave us measuring spheres. He gave us the formula (4/3 π r3) But he didn't show us how to figure out the problem.
I don't know how your suppose to figure it out.
Just a couple of questions:
1. If we imagine space to be curved over a sphere is it possible to travel in one direction and eventually end up where you started, assuming that the sphere it self is not expanding.
2. What's the difference between a two sphere and a three sphere? I find it...
In introductory physics laboratories, a typical
Cavendish balance for measuring the gravita-
tional constant G uses lead spheres of masses
1.8 kg and 13.9 g whose centers are separated
by 5.77 cm.
Calculate the gravitational force between
these spheres, treating each as a point mass...
Howcome the ratio of the surface area of spheres are not equal to the ratio of volume of spheres?
For example if I had two spheres, with an aspect ratio of 1:4 when comparing surface areas, yet I have 1:8 between those same spheres when comparing volume.
This doesn't make sense to me...
Two small nonconducting spheres have a total charge of 80 microC. When place 1.06 m apart, the force exerts on the other is 12 N and is repulsive. What is the charge of each. What if the force were attractive?
Given: k, F = 12 N if repulsive but F = -12 N if attractive, Q1 + Q2 = 8 x 10^-5 C...
I have a question regarding charged spheres and voltage measurements. I've talked to my physics professor about it, and he wasn't quite sure of the answer (although to be fair, I asked briefly at the end of class.)
Imagine that you had a spherical shell, charged to a high potential (for the...
there are 2 probs here.
1) The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.0680 V exists across the membrane. The thickness of the membrane is 7.95×10-9 m. What is the magnitude of...
Here's a question from my textbook:
Two copper spheres, each having a mass of .4 kg, are separated by 2 m.
(a) How many electrons does each sphere contain? The atomic mass of copper is 63.5 g/mol, and its atomic number is 29.
(b) How many electrons would have to be removed from one sphere...
Heya, this is my first post, I hope it isn't too hard :smile:
Alright, the problem goes like this. I put a sphere into a box to be shipped somewhere, it fits perfectly into the box and the sphere has a radius R. Now I have 8 styrofoam spheres that are placed on the corners of the box, find...
HELP HELP HELP! spheres!
Consider a solid sphere of radius R containing a total charge Q which is uniformly distributed throughout the volume with a volume charge density rho.
a) find the total force exerted by the electrostatic field on the charge in the 'northern hemisphere'. express your...
Hi ppl, ne1 know how to approach this one?
Given P(1,4,-1), Q(1,2,-1) and R (3,2,-2), show that PQR is right angled and hence find the equation of the smallest sphere S which passes through P,Q and R.
Okay, I got the right angle by showing PQ and QR to be perpendicular with the dot product...
Two concentric spheres of radii 1.65 cm and 19.0 cm, respectively, are given equal but opposite charges of 6.35e-08 C. How much energy is stored in the system (in J)?
I know V = U/q where U would be the entire energy stored in the system beacuse it's not in motion. I know q's but I just...
Two spheres with radius of .10 m and a mass of 25 kg are floating in deep space. Their gravitational attraction keeps them in contact. If we go in and manually separate these spheres to a large distance, by how much will the potential energy involved in their interaction increase.
Is there...
Two spheres collide and assume that the collision is perfectly elastic. Also --only linear momentum.
I have the relationship:
(va' - vb') dot N = -(va - vb) dot N
Where N is the normal vector at the point of collision. va and vb are initial velocities of object A and B, respectively...
Two small spheres of mass m are suspended from strings of length L that are connected at a common point.
One sphere has charge Q, the other has 2Q.
The strings make angles (theta1) and (theta2) with the vertical.
(a) How are theta1 and theta2 related?
(b) Assume theta1 and theta2 are...
If the black hole has infinite capacity to store mass,why,in a case of the sucking up of the sun,why would their(crudely described)sunny-side up expel huge jet streams of flames and heat? Cant they absorb heat energy and UV since they have capacity to collect mass?
If it is possible the Black...
Two identical small spheres possessing charges q1 and q2 are separated by distance r. Which charge would produce the greatest inecreas in the electric force between the tow spheres?
1. double charge q1
2. double r
3. double r and q1
4. double r, q1, and q2
I'm pretty sure it's #1