All Questions
259
questions
0
votes
1
answer
85
views
2 magnet bars are placed in same plane and one of them can rotate freely. The relation as system is balanced [closed]
Each magnet is in same plane.
$$ \ell \ll r $$
The magnet1 has been fixed.
The magnet2 can rotate with center of the magnet itself.
$$ \theta_{1} ~~,~~ \theta_{2} :=\text{each angle between the ...
1
vote
1
answer
302
views
Magnetic field in two conducting parallel plates. (stripline) [closed]
Studying Poynting Vector power density I found a geometry that I really can't figure it out and is nowhere to be found on the internet.
I have two conducting parallel plates with opposite surface ...
0
votes
0
answers
80
views
The direction of the magnetic field around a conductor
What will be the direction of the magnetic field be around a wire that carries current (straight conductor) between the poles of a permanent magnet?
I'm thinking it will be counterclockwise, since ...
- 117
3
votes
1
answer
424
views
Does Motional EMF depend on the shape of path taken or depends on the shortest distance between given two points?
A semi-circular conducting wire of radius 2m is rotated in a uniform magnetic field $B=0.1\text{ T}$ ($\vec k$) about point $O$ with angular speed $\omega=10\text{ rad/s}$ as shown in the figure. The ...
- 33
0
votes
1
answer
89
views
What's the magnetic field produced by a current carrying circular loop at a point on its plane?
How do I find the magnetic field in this case? I already know about the magnetic field produced by a current carrying loop at an axial point or center but what about the point on its plane?
- 11
1
vote
0
answers
22
views
Magnetic field due to a line and a plane
I need to find the magnetic field produced by this arrangement
Let me explain the image: The vertical line is a conducting straight line with a current being conducted. Now, the horizontal line is ...
- 980
0
votes
2
answers
125
views
Calculate magnetic field $B$ in a magnetized sheet parallel to $xy$ plane
I'm having some trouble with this exercise:
An infinite sheet of parallel faces with thickness $d$ is uniformly magnetized. Its magnetization is 10 A / m and forms an angle of 60º with the normal to ...
- 221
0
votes
0
answers
74
views
Magnetic force between two parallel straight current wires one of them infinite and the other one finite
This problem is very easy if the magnetic field from the infinite wire is applied over the finite one and the Lorentz force is calculated straightforward.
I'm trying to make the calculation in the ...
0
votes
1
answer
181
views
Magnetic flux with two concentric cirular loops
Suppose I have two cocentric circular loops, one with radius $R_2$ and one with radius $R_1$ where $R_2$ is the radius of the larger loop. Current is flowing in the outerloop and is changing over time,...
- 273
0
votes
1
answer
331
views
Does a square loop carrying a steady current $I$ produce any force?
I have a square loop which carries a steady current as shown below:
I was able to find the magnetic field at the centre of the square loop to be: $B=\frac{\sqrt{2}\mu_0I}{\pi R}$
My question is there ...
- 187
-3
votes
1
answer
81
views
Centre of Circular Motion of $q$ in a Uniform Magnetic field [closed]
Initial Conditions
A charged particle $q$, is initially at rest at $(x,y)$. It is given velocity, $v_o~m.s^{-1}$ along positive $X$-axis.
There exists a Uniform Magnetic Field $B_0$ in the whole ...
- 218
1
vote
3
answers
107
views
Loss of energy when permanent magnet falls trough coil?
Is there a loss of mechanical energy when a permanent magnet falls trough a coil?
Given a magnet with mass m and a coil with N windings. The coil is placed vertically so the magnet can fall trough. ...
- 15
2
votes
1
answer
878
views
Why should there be an induced electric field if magnetic field is constant? [closed]
Problem statement:
The curved surface of a very long hollow non conducting cylinder of radius $R$ is uniformly charged with surface charge density $\sigma$. A non conducting small circular ring of ...
- 362
1
vote
2
answers
331
views
How to find magnetic field as a function of $r$ from axis of solenoid?
I was solving this problem:
Whose answer is given as:
I understand the part for calculating the field outside the cylinder, but for inside, I don't get it. If we apply Ampère's circuital law by ...
- 362
0
votes
1
answer
38
views
Magnetic field intensity and magnitude [closed]
How can i find the magnetic field intensity and magnitude in P ? Also around the first wire ?
I hope you can help me and thanks in advance.
