All Questions
259
questions
0
votes
2
answers
276
views
I want to find the force on a circular wire around a solenoid using $d\mathbf{F} = Id\mathbf{l}\times \mathbf{B}$? What magnetic field do I use? [closed]
I've found the current induced in the wire due to the solenoid by using $I = \frac{\int \vec{E} \cdot \vec{\mathrm dl}}{R}$, but I'm confused as to whether I should use the magnetic field due to the ...
- 3
0
votes
1
answer
66
views
How is a current induced in this translating wire?
I am familiar with the principles of electromagnetic induction, but I am stuck on the scenario below: a long straight wire is translating in a uniform magnetic field. According to my book, this causes ...
- 368
0
votes
3
answers
850
views
Right Hand Rule Help: Part 2
I’m confused about this problem with the right hand rule.
According the book:
My thumb should point up (as expected)
My fingers should point into the page (I don’t know how that would work)
My palm ...
- 113
1
vote
1
answer
351
views
Square loop above a wire with a current running through the wire [closed]
A rectangular loop is above a wire with a current running through it. If the loop is connected to an external circuit, what is the EMF generated by the loop to the circuit? There's a bit more to it ...
- 31
0
votes
1
answer
663
views
Magnetic field of coaxial cylindrical capacitor
I have a coaxial cylindrical capacitor as shown, with inner radius a and outer radius b.
The potential difference across both cylinders is V. I need the magnetic field everywhere when the inner ...
- 21
2
votes
2
answers
487
views
Magnetic Field calculated from Magnetic vector potential [closed]
Reference : $^{\prime\prime}$Physics of Atoms and Molecules$^{\prime\prime}$ by B.H.Bransden and C.J.Joachain, 1983 Edition.
In $\boldsymbol{\S}$4.1 The electromagnetic field and its interaction with ...
1
vote
1
answer
77
views
Find the emf in the loop by two methods [closed]
In the Figure below assume the magnetics are shaped such that the magnetic field is in
the $z$ direction and varies as
$$
B_0 = B_m\left(1-\frac{x^2}{a^2}\right)\hat{z}
$$
Find the emf in the loop by ...
- 111
-1
votes
1
answer
113
views
Why, when an electromagnet is connected to a circuit, does the electric current not reach the required strength immediately, but gradually? [closed]
When an electromagnet is connected to a circuit, the electric current does not reach the required strength immediately, but gradually. Why?
When the battery terminals of the flashlight are briefly ...
1
vote
1
answer
64
views
Contradiction in Faraday's law and Motional EMF
Consider two parallel conducting frictionless rails in a gravity free rails parallel to x axis. A movable conductor PQ( y direction) of length $l$ slides on those rails. The rails are also connected ...
- 517
1
vote
0
answers
35
views
Two bar magnets taped together in opposite direction (north-south) dropped through a coil
I conducted an experiment where I have to align two bar magnets so that both ends are “north - south” and tape them together. Then, I have to drop them through the center of a coil of 400 turns
...
- 11
0
votes
1
answer
461
views
Which area is considered while calculating the magnetic flux?
We have a situation in which we deliberately let the magnetic field lines pass through only half of the area of the loop. So, while calculating magnetic flux do we only use that area from where field ...
- 1,867
0
votes
1
answer
1k
views
Would the following 2 solenoids repel or attract each other? [closed]
Question:
Describe what will happen to two solenoids that are arranged next to each other as shown. The solenoids are the same length, and have the same number of turns and current flowing through ...
0
votes
1
answer
34
views
Motional EMF in a wire in the plane of magnetic field and velocity
If velocity of a straight wire and magnetic field make acute angle and the wire lies in the same plane, is there an EMF developed in the wire? It is a thin wire. The velocity is perpendicular to it. I ...
- 1
2
votes
1
answer
1k
views
Confusion even over such a simple application of the Right-hand rule to determine direction of magnetic field
After reading this question on this site I learned that the direction of the magnetic field is given by $\boldsymbol{B}=\frac{1}{\omega}\boldsymbol{k}\times \boldsymbol{E}$
The left diagram below is a ...
- 295
0
votes
2
answers
2k
views
Magnetic Field of a current carrying loop
The numerical is given below:
Q: Compute the magnetic field of a long straight wire that has a circular loop with a radius of 0.05m. 2amp is the reading of the current flowing through this closed loop....
