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A moving coil galvanometer consists of a coil in a uniform magnetic field Bo, suspended fro a fibre of torque constant C, current I produces a deflection O=nABoi/c where n is the number of turns and A is the area of the coil. The period of oscillation T=2?(I/C)1/2 where I is the moment of inertia. The resistance of the coil and the circuit in which it is placed is adjusted to give a critical dumping Rc=n2 A2Bo2/2(ic)1/2 . if the minimum detectable current produces deflection equal to thermal -root mean square value O, show that minimum current is given by
imin =( ?KT/ TRc)1/2
List four sources of information which are essential to the designer of this electrical installation
Give some applications of constantan. Constantan is an alloy of nickel and copper. It is used in thermocouples, motor starters and precision resistors.
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#question. i want design of inductive coupling to transfer power @ 2 watt in air gap of 5mm radial distance..
An n-channel depletion MOSFET, for which I DSS = 7mA and V P = 4 V, is said to be operating in the ohmic region with drain current i D = 1 mA when v DS = 0.8 V. Neglecting the
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The Octal Inverter 74LS 240 It is similar to above octal buffer but with inverter output. The logic diagram is shown in figure below . Normal 0
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