Chapter 27: Problem 3
Fluctuations in Earth's magnetic field due to changing solar activity can wreak havoc with communications, even those using underground cables. How is this possible?
Chapter 27: Problem 3
Fluctuations in Earth's magnetic field due to changing solar activity can wreak havoc with communications, even those using underground cables. How is this possible?
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Get started for freeA magnetic field is given by \(\vec{B}=B_{0}\left(x / x_{0}\right)^{2} \hat{k},\) where \(B_{0}\) and \(x_{0}\) are constants. Find an expression for the magnetic flux through a square of side \(2 x_{0}\) that lies in the \(x\) -y plane with one corner at the origin and sides coinciding with the positive \(x\) - and \(y\) -axes.
The magnetic field inside a 20 -cm-diameter solenoid is increasing at 2.4 T/s. How many turns should a coil wrapped around the outside of the solenoid have so that the emf induced in the coil is \(15 \mathrm{V} ?\)
The current in a series \(R L\) circuit increases to \(20 \%\) of its final value in \(3.1 \mu \mathrm{s}\). If \(L=1.8 \mathrm{mH},\) what's the resistance?
Show that the volt is the SI unit for the rate of change of magnetic flux, making Faraday's law dimensionally correct.
The current in a series \(R L\) circuit rises to half its final value in \(7.6 \mathrm{s}\) What's the time constant?
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