ECE :: Materials and Components
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Thermistor is used in
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The electric dipole moment of a neutral system of point charges Q1, Q2.... is
Qiri . The charges Qi -
Assertion (A): The resistance of a copper specimen changes by about 22% when temperature is increased from room temperature to 700°C.
Reason (R): The physical properties of a material are determined mostly by the extent of impurities.
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Assertion (A): For most metals, Fermi energy EF is less than 10 eV.
Reason (R): Fermi level of a metal is given by EF = 3.64 x 10-19 (n)2/3 where n is number of free electrons/m3 of metal.
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The capacitance of an insulated conducting sphere of radius R in vacuum is
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The transition of electron from energy level W1 to W2 is associated with emission or absorption of electro magnetic radiation of frequency f such that
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A material has N spins per m3. If Np are the dipoles per m3 parallel to field and Na are the dipoles per m3 anti-parallel to field, the magnetisation is
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Even at room temperature, an intrinsic semiconductor has some holes. These holes are due to
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