ECE :: Materials and Components
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If the diameter of a wire is doubled, its current carrying capacity becomes
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The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is
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Assertion (A): Silicon is less sensitive to changes in temperature than germanium.
Reason (R): Cut in voltage in silicon is less than that in germanium.
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Material which lack permanent magnetic dipoles are known as
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A parallel plate capacitor has its length, width and separation doubled. It fringing effects are neglected, to keep the capacitance same, the dielectric constant must be
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Assertion (A): In imperfect capacitors, the current does not lead the applied ac voltage by 90°.
Reason (R): When subjected to ac fields, the dielectric constant can be expressed as ∈'r - j∈"r.
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If a sample of germanium and a sample of silicon have the same impurity density and are kept at room temperature
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When an electric field E is applied to solid and liquid insulating materials, the internal field Ei acting at the location of atom is such that
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. When dimensions are changed, A become four times and d becomes twice.