Materials and Components
In a coaxial cable, braided copper is used for
Answer: B
Braided material is used for shield.
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In paramagnetic materials
Answer: A
In paramagnetic materials interaction between neighbouring dipoles is negligible.
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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
Answer: A
No answer description available for this question.
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The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be
Answer: D
Inductance is inversely proportional to the core length.
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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.
Answer: A
No answer description available for this question.
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Ferrites have
Answer: B
Resistivity of ferrites is very high as compared to that of iron. Hence eddy curretns are much less.
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Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.
Reason (R): For diamagnetic as well as paramagnetic materials, μr is nearly equal to 1.
Answer: A
Magnetic susceptibility = (μr - 1)H.
For diamagnetic and paramagnetic materials magnetic susceptibility is very very small and μr = 1.
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As per Bohr's postulate, only those circular orbits are stable for which the angular momentum is equal to an integer times 
.
Answer: A
It is a quantum condition postulated by Bohr.
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The dielectric constant of ferroelectric materials can be expressed by the equation
Answer: A
No answer description available for this question.
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