An intense magnetic field is to be produced by a superconducting coil. Which one of the following is essential?
A. The critical temperature TC must be high so that heating of the oil doesn't raise the temperature above TC
B. The magnetic field produced by the current should be less than the critical field
C. The material should be pure so that its high conductivity allows more current to flow through the coil
D. Type-I materials should be used so that superconductivity exists below a sharply defined critical field
Answer: Option B
This Question Belongs to Electronics And Communications Engineering >> Materials And Components
For making a capacitor it is better to have a dielectric having
A. High permittivity
B. Low permittivity
C. Permittivity same as that of air
D. Permittivity which is neither high nor low
As the viscosity of a liquid increases, the relaxation time
A. Remains constant
B. Increases
C. Decreases
D. First decreases then increases
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