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Results tagged with electromagnetism
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user 144045
The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.
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Inducing emf in a circular coil
According to Faraday's Law (ignoring Lenz's law, which isn't relevant here):
$$\epsilon = \frac{\Delta N\phi}{\Delta t}$$
Therefore, the EMF ($\epsilon$) is proportional to the rate of change of mag …
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3
answers
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What causes magnetism?
Electric fields are caused by particles that have charge. Gravitational fields are caused by particles that have mass. What is the property of a particle that causes it to interact with a magnetic fie …
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A changing magnetic field passes through a wire loop but the loop itself is not in the field... [duplicate]
$$\nabla \times \vec{E} =-\frac{\partial{\vec{B}}}{\partial{t}}$$
Applying Stokes' theorem:
$$\oint_{loop} \vec{E} \cdot d\vec{l}=\int_S -\frac{\partial{\vec{B}}}{\partial{t}} \cdot d\vec{S}$$
Wher …
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1
answer
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Putting a charged sphere in a uniform electric field - can we superpose the individual field...
Let's say we want to find the potential outside a charged metal sphere with total charge $q$ when it is placed in a uniform magnetic field $\vec{E}_0$. Infinitely far from all other charge, the charge …
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How to verify generally that the formula for electric potential is a solution to Poisson's e...
$$V(\vec{a})=\frac{1}{4 \pi \epsilon_0}\int_\tau \frac{\rho(\vec{r})}{l}d\tau$$
This is the formula for the potential at a general point $\vec{a}$. Note that $l$ in this formula is the magnitude of t …
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Why does $\vec{B}\cdot\frac{\partial \vec{B}}{\partial t}=\frac{1}{2}\frac{\partial}{\partia...
$$\vec{B}\cdot\frac{\partial \vec{B}}{\partial t}=\frac{1}{2}\frac{\partial}{\partial t} (B^2)$$
Griffiths states this result in his derivation of the Pontying vector, but I have absolutely no idea w …
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Taking into consideration the non-0 value of an equipotential in a method of images problem
If the infinite conducting plane in the diagram above is grounded, then $V=0$ on the plane and the image problem is easy to solve - just put the dotted $-q$ charge there and the $V=0$ equipotential …
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Is potential difference the same across each branch in a parallel circuit under ALL circumst...
If you place a cell with negligible internal resistance and an EMF of 5V in parallel with 2 resistors, as shown below, each resistor will have a potential difference of 5V across it.
However, if yo …
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