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The magnetic field which destroys the superconductivity is called
d Explanation: Critical field is that strong magnetic field which can destroy the superconductivity of a material. The temperature at which this occurs is called transition temperature.
d
Explanation: Critical field is that strong magnetic field which can destroy the
superconductivity of a material. The temperature at which this occurs is called transition
temperature.
See lessFor a dielectric which of the following properties hold good?
b Explanation: Superconductors are characterised by diamagnetism behaviour and zero resistivity, which true for a dielectric. They occur only at low temperature. Thus a dielectric can become a superconductor at low temperatures with very high dielectric breakdown voltage.
b
Explanation: Superconductors are characterised by diamagnetism behaviour and zero
resistivity, which true for a dielectric. They occur only at low temperature. Thus a
dielectric can become a superconductor at low temperatures with very high dielectric
breakdown voltage.
See lessFind the dielectric constant for a material with electric susceptibility of 4.
b Explanation: The electric susceptibility is given by χe = εr – 1. For a susceptibility of 4, the dielectric constant will be 5. It has no unit.
b
Explanation: The electric susceptibility is given by χe = εr – 1. For a susceptibility of 4,
the dielectric constant will be 5. It has no unit.
See lessA dielectric can be made a conductor by
b Explanation: On increasing the temperature, the free electrons in an insulator can be promoted from valence to conduction band. Gradually, it can act as a conductor through heating process. This condition is called dielectric breakdown, wherein the insulator loses its dielectric property and startRead more
b
Explanation: On increasing the temperature, the free electrons in an insulator can be
promoted from valence to conduction band. Gradually, it can act as a conductor through
heating process. This condition is called dielectric breakdown, wherein the insulator
loses its dielectric property and starts to conduct
See lessIdentify a good dielectric.
b Explanation: Iron and magnesium are metals. Hence they need not be considered. Both ceramics and plastic are insulators. But dielectric constant is more for ceramics always. Hence ceramics is the best dielectric.
b
Explanation: Iron and magnesium are metals. Hence they need not be considered. Both
ceramics and plastic are insulators. But dielectric constant is more for ceramics always.
Hence ceramics is the best dielectric.
See lessA dielectric is always an insulator. But an insulator is not necessarily a dielectric. State True/False.
a
a
See lessThe subject of cybernetics deals with the science of
B. Control and communication
B. Control and communication
See lessHow many numbers could ENIAC store in its internal memory
B. 20
B. 20
See lessWhich of the following machine was not invented by Charles Babbage?
A. Tabulating Machine
A. Tabulating Machine
See lessWhich of the following processors use RISC technology?
B. Power PC
B. Power PC
See less