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Energy stored in a magnetic field
Consider a circuit consisting of a voltage supply, switch, resistor and a coil of N turns wound on a toroid of length l, all in series.
With the switch open, no current flows inthe coil and therefore there is no flux produced in the core of the coil.
At t=0, the switch is closed and the current builds up with time. It is not instantaneous,because the coil produces a back emf that limits the rate of rise of current
where v = the time dependent back emf created by the coil. The instantaneous power being deliveredby the supply at time t is
vs .i=i2 R+v.i
Determine and plot for 5 keV to 100 MeV the fraction of the total cross section due to each of the four interaction processes for (a) hydrogen, (b) nitrogen,
Note, the armature current is produced in pulses as the armature rotates under the poles, so the torque also pulsates. This can give rise to extra wear on bearings and the engin
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Molecular Chain (MIT, Princeton, Colorado) Consider a one-dimensional chain consisting of N molecules which exist in two configurations, α, β, with corresponding energies and
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To have the same value of P e , show that E b /N 0 in a coherent-ASK system has to be twice that in a coherent PSK system.
Define temperature coefficient of resistance. Temperature coefficient of resistance is explained as the change in resistance of a material per ohm per degree change in temperat
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