Answer
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Hint: Students are supposed to have a basic idea of SI units, so they can answer these kinds of questions by eliminating options or directly arriving at the answer. Also, CGS units are important since questions can be framed in CGS units sometimes.
Complete step by step answer:
If we consider option (D), gauss is a unit in the CGS system which is used for magnetic flux density. (Magnetic flux density not magnetic flux) and it is in CGS scale, so according to the stated reason, it is not a SI unit for magnetic flux. If we consider option (C), tesla is the SI unit of magnetic flux density in the SI unit scale. Both gauss and tesla are units for magnetic flux densities in the different unit system. But both are not the answer to our question.
Coming to option (A), Maxwell is a unit for magnetic flux in the CGS system. It is not our answer since it is a unit in the CGS system not in SI system. For option(B), weber is the SI unit of magnetic flux in SI units.
So our answer to the question is option(B)-Weber.
Note:
The official definition of weber is- The weber is the magnetic flux that, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second.
Tesla is defined as the flux density of 1$\text{weber/}{{\text{m}}^{2}}$.
Complete step by step answer:
If we consider option (D), gauss is a unit in the CGS system which is used for magnetic flux density. (Magnetic flux density not magnetic flux) and it is in CGS scale, so according to the stated reason, it is not a SI unit for magnetic flux. If we consider option (C), tesla is the SI unit of magnetic flux density in the SI unit scale. Both gauss and tesla are units for magnetic flux densities in the different unit system. But both are not the answer to our question.
Coming to option (A), Maxwell is a unit for magnetic flux in the CGS system. It is not our answer since it is a unit in the CGS system not in SI system. For option(B), weber is the SI unit of magnetic flux in SI units.
So our answer to the question is option(B)-Weber.
Note:
The official definition of weber is- The weber is the magnetic flux that, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second.
Tesla is defined as the flux density of 1$\text{weber/}{{\text{m}}^{2}}$.
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