In the experiment of a neon lamp, the induced emf in a coil during the growing of the current is \( \qquad \) the induced emf in it during cutting off the current. (A) greater than (B) less than (C) equal to (D) zero
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According to Faraday's law of electromagnetic induction, the induced emf in a coil is proportional to the rate of change of magnetic flux through the coil. Show more…
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Which of the following is implied by Lenz's law? A. The induced emf always opposes the emf that produced it. B. The induced current always opposes the current that produced it. C. The induced emf always opposes the the change in flux that produced it. D. The induced emf always opposes the flux that produced it. E. The induced emf always opposes the magnetic field that produced it.
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A conductor $A B$ lies along the axis of a circular conducting loop $C$ of radius $r$. If the current in the conductor $A B$ varies at the rate of $x \mathrm{~A} / \mathrm{s}$, then the induced emf in the coil $C$ is : (a) $\frac{\mu_{0} r x}{2}$ (b) $\frac{1}{4} m x$ (c) $\frac{\mu_{0} \pi x r}{2}$ (d) zero
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