All Questions
Tagged with electromagnetic-induction magnetic-fields
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Can ionized air be used as a conductive medium for eddy brakes?
Sort of a conceptual engineering question, apologies if I am missing something, my background is in mechanical engr.
Essentially, I was inspired by the classic experiment of dropping a magnet in a ...
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Does a constant magnetic field induce an emf in space irrespective of what is inside the space?
I came across a question which was a pyq from an Indian examination.The question states; An insulting rod of length L is falling with a velocity v perpendicular to B as well as perpendicular to L. ...
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What type of electric field is created by time varying magnetic field?
Example when an current carrying loop is placed in external magnetic field varying with time some emf is produced in the coil now we know that emf is due to electric field and the loop is experiencing ...
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Doubling the length of a solenoid doubles its inductance. Two identical solenoids in series have up to four times the inductance due to M. Why?
The inductance of a long solenoid with $N_o$ turns and a length $l_o$ is
$$L_o=\pi r^2 \mu_0\frac{N_o^2}{l_o}$$
If I now make a new solenoid, $L_{new}$, with double the length of the original ($l_{new}...
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Non-parallel magnetic dipole falling throug copper tube
What happens with magnetic dipole while falling through copper cylinder?
If it's parallel to z-axis (shown on picture below with red color) we know that it stays parallel to the z-axis all the way ...
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Force components on dipole falling through copper ring
We have a magentic dipole parallel with z-axis (shown on the diagram below) falling through copper loop, because of changing magnetic flux there is induced current in cooper ring/loop and consequently ...
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Magnet falling in copper tube, radial force component
Consider a Dipole magnet falling through infinite copper pipe. If we displace a magnet a little bit so that the dipole isn't pointing to the same way as pipe (dipole isn't parallel to the pipe) we get ...
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Magnetic force is a no work force. Why is it doing work here?
Here the rod is projected with a velocity $v_0$ . Due to change in flux in the loop, we have an induced emf in the loop, which induces a current $i$ that exerts a force $Bil$ where $B$ is the magnetic ...
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Aluminium foil sticks to steel ring in Ring Launcher
In this video (timestamp included in link) a very strange phenomenon is demonstrated. The aluminium foil layer initially shows no reaction to the alternating magnetic field, but as soon as the thick ...
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Motion of a conducting loop in a time-dependent external magnetic field
The problem statement:
"A conducting ring of radius 'r' is held stationary in a magnetic field $\vec{B}$ which, initially has a magnitude of $B_0$ and is inclined at $45^\text{o}$ to the area ...
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Why is there an EMF induced across a ring falling in a magnetic field in a manner such that the area vector is parallel to it?
I had an exam today, wherein an object was falling via a magnetic field such that the area vector was parallel to the field (uniform), the question was is an EMF induced, my answer was no,as the ...
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Does induced current lag induced emf in mutual induction?
In a circuit with an alternating emf source, resistor and inductor, the current lags the induced emf on the inductor because the inductor initially opposes a change in current. Now, consider a circuit ...
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Understanding the symmetry argument in determining induced electric fields
I am trying to understand how to determine the shape and direction of the electric fields induced by a changing magnetic field. But all of the resources I have read make use of the following symmetry ...
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Suspicious EMF equation
Some context: I am trying to get the equation of motion for a dipole magnet falling through copper pipe. To proceed I need to calculate the EMF. We can do this by using Faraday's law,
$$\oint_{\...
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Electromagnet attracting permanent magnet?
Permanent magnet gets attracted to electromagnets iron core ,but if we energize electromagnet for attraction force will it attract strongly?
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