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Physics

Questions tagged [electromagnetic-induction]

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This tag is for questions regarding to electromagnetic induction, a process in which a conductor is put in a particular position and magnetic field keeps varying or magnetic field is stationary and a conductor is moving. Electromagnetic Induction was first discovered way back in the 1830’s by Michael Faraday.

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1answer
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Imagine the following experiment:Assume that the red rod is a hypothetical north magnetic monopole while the blue torus is charged with a positive charge $q$. The blue torus is rotated as shown.Q...
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1answer
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So I have this problem. I want to measure the efficiency of an experimental PMDC motor. As you know 𝜂 = P_out / P_in, in the case of a PMDC: 𝜂 = P_mech / P_el. P_el = VI, but P_mech is a problem. I ...
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Consider this example I met in my physics class:An infinitely long cylindrical region contains a uniform magnetic field$B$ within it whose magnitude varies with time. Determine the induced electric ...
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Does an electric field exist outside a non-perfect conductor wire with a constant current flowing through it? I think there might be an electric field parallel to the wire because current in the wire ...
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When we touch a conductor with eddy current flowing on it, will we get a shock?Because in my opinion there's an induced EMF due to which eddy current flows (assume the conductor is in the region ...
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1answer
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While solving some electromagnetic induction questions, I stumbled upon one that kept a solenoid in a loop with common axis. We were asked to find the current in the loop when a current (and thus the ...
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I am analyzing an electromagnetic system involving a permanent magnet using the magnetic vector potential A, defined by B = ∇ × A.The magnet is made of a conductive material (e.g., some grades of ...
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We learn already in school and later in lectures that a metal plate pushed into a magnetic field is slowed down by eddy currents. The direction of the total force due to the induced currents is ...
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I am studying the phenomena behind guitar pickups. I was then wondering if there is a way to link the magnetic field variations (thus the electromotive force) to the displacement of a string (perhaps ...
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2answers
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In a typical example: Consider a magnet falling through a coil of wire. This coil of wire is connected to a galvanometer which completes the circuit. As the magnet approaches and goes through the coil ...
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1answer
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Suppose there is a long solid cylindrical conductor of radius $\textbf R$ in a uniform magnetic field of strength $\textbf B_0$, directed along the axis of the cylinder. If the cylinder is rotated ...
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Let's consider a simplified model of a guitar pickup, which is basically a bar magnet with a coil wrapped around it like so:The principle of operation is that a ferromagnetic/iron string moving in ...
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1answer
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If one has a loop of wire in a constant and uniform magnetic field, would deforming the loop induce a flow of current in the wire?In particular, in a case were we change the area of the loop, e.g. ...
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1answer
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Kirchhoff's voltage law is based on conservative field whereas the induced field developed in an inductor is non conservative so how do we use kirchhoff's voltage law in a loop with one of the ...
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We know from Faradays law or Maxwells equation an EMF is generated when theres a changing magnetic flux trough the wires enclosed surface$$\oint_{\text{closed loop}} \mathbf{E}\cdot d{\boldsymbol \...

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