ECE :: Materials and Components
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A parallel plate capacitor having C = 200 x 10-12 F has loss dielectric having tan δ = 4 x 10-4. At an ac voltage of f = 106 Hz and peak value 2 V, the dielectric losses are
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In ferromagnetic materials, the orientation between neighbouring permanent dipoles is parallel.
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Resistivity of copper is lower than that of nickel. When a small percentage of copper is added to nickel, the resistivity
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Resistivity of metals consists of two parts, one part constant and the other temperature dependent.
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Assertion (A): ∈0 has the dimensions of farad per meter.
Reason (R): D = ∈0∈r E.
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When temperature is more than ferromagnetic curie temperature, the behaviour of a ferromagnetic material is similar to that of paramagnetic material.
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If ω0 is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ω, when a magnetic field B is acting is ω ≅ ω0 + (e/2m)B.
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