ECE :: Materials and Components
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In carbon resistor colour code, if the third band is of silver, it indicates
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In a metal, the drift velocity of electrons in the presence of a electric field E is
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At a temperature of about 1 K, aluminium is a
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An electron is moving in a circular orbit of radius R at angular velocity ω0 in a field free space. If a magnetic field B is created, the velocity of electron ω will be given by the equation
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If v is the velocity of electron, tc is the average time between collisions, the mean free path λ = vtc.
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Assertion (A): An electron having charge - e and mass m and lying in an electric field E is subjected to an acceleration - (e/m) E.
Reason (R): If there are n electrons/m3 moving with velocity vx and each electron has a charge - e, the current density J = - n evx.
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When a pentavalent impurity is added, the semiconductor becomes
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In body centred cubic structure, comers and centre of the cube are occupied by identical atoms.
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For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to
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The orientation polarization is
- directly proportional to temperature
- inversely proportional to temperature
- inversely proportional to square of permanent dipole moment
- directly proportional to square of permanent dipole moment.
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