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Explain factors that change the resistivity of conducting materials. Temperature- Electrical resistance of most metals rises with increase of temperature whereas those of sem
Q. A magnetic force exists between two adjacent, parallel current-carryingwires. Let I1 and I2 be the currents carried by the wires, and r the separation between them.
N-type semiconductor is an example of (A) Extrinsic semiconductor. (B) Intrinsic semiconductor. (C) Super conductor. (D) Insulators.
A balanced star-connected load is connected across a three phase 450V 50 Hz AC supply. Each load element has an impedance of 5+j12 Ω. Calculate: (i) The power factor of the
Q. Explain the measurement of frequency in detail by using Wein's bridge. Sol. The Wein's bridge is presented here not only for its use as an AC bridge to measure frequency
A 3 phase 60 hertz induction motor has 8 poles and operates with a slip of .05 for a certain load. Compute in r.p.m. the (a)speed of the rotor with respect to the stator, (b)spe
Diffusion Current : The carrier currents are also due to concentration gradients in the doped material which lead to diffusion of carriers from high concentration region to l
Characteristics of Stepper Motors The main characteristic of stepper motors is torque versus stepping or pulse rate. It give the variation of torque as a function of pu
The increase in the current is building up the magnetic field surrounding the coil. Energy is stored in that field. Consider the energy supplied by the voltage source during the
Q. In the ideal inverting summing amplifier circuit with two inputs, for R f = 10 k, find R 1 and R 2 so that v o = -10v i1 -5 vi2 .
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