ECE :: Materials and Components
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Semi conducting materials are all
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Silicon and germanium atoms combine orderly into array of atoms located in repetitive geometric pattern. This pattern is called
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In a pure sample of silicon
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Orbital magnetic dipole moment is due to the motion of electron in its orbit around nucleus.
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Assertion (A): ∈r can be determined experimentally by measuring the capacitance of a parallel plate capacitor with and without the dielectric.
Reason (R): Capacitance of a parallel plate capacitor =
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In a homogeneous magnetic field H of a solenoid, the core carries a magnetic dipole moment M per unit volume equal to
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Assertion (A): In a parallel plate capacitor having area of plate 1 m2 and plate separation 1 m, the capacitance C and resistance R are given by C = ∈0∈'r and R =
where ω is frequency, ∈r' and ∈r" are real and imaginary parts of dielectric constant.Reason (R): The imaginary part of electric constant is responsible for dielectric losses.
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Assertion (A): Silicon is the most favoured semiconductor material.
Reason (R): PIV for silicon diode is more than that for germanium diode.
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Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.
Reason (R): Thermionic emission current ∝ T2 e-Ew/kT.
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