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Which circuit will not show current in ammeter

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Important Questions on Semiconductor Electronics: Materials, Devices and Simple Circuits

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In the energy band diagram of material shown in figure open circles and filled circles denotes holes and electrons respectively. The material is

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A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly :-
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Consider the junction diode is ideal. The value of current through the resistance of 300 Ω is

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A silicon specimen is made into a P-type semi-conductor by doping, on an average, one indium atom per 5×107 silicon atoms. If the number density of atoms in the silicon specimen is 5×1028 atoms m-3, then the number of acceptor atoms in silicon per cubic centimetre will be
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A full wave rectifier circuit along with the input and output voltages is shown in the figure.

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The contribution to output voltage from diode 2 is,

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In a p-n junction the depletion layer of thickness 10-6 m has potential across it is 0.1 V. The electric field is V m-1
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If l1,l2,l3 are the lengths of the emitter, base and collector of a transistor then
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A common emitter amplifier gives an output of 3 V for an input of 0.01 V. If the current gain of the transistor is 100 and the input resistance is 1 , then the collector resistance is