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The SI unit of magnetic field is:
A. Tesla
B. Weber
C. Weber-meter
D. Gauss

Answer
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Hint: In this problem we need to use the SI unit for flux per unit area, since it is equal to the magnetic field. Doing this will solve your problem.

Complete step-by-step answer:

The unit of magnetic field is Tesla. It is the SI unit of magnetic field. Magnetic field is the measure of magnetic flux per unit area.

1tesla = 1weberm2.

Hence, Tesla is the unit of Magnetic field.

So, the correct option is A.

Note: The SI unit of magnetic field is in the name of Nikola Tesla (Symbolized as T). We should know that 1tesla = 1weberm2. We can do this by learning the formula that the magnetic field is equal to flux per unit area also called magnetic density. Knowing this you will get the correct answer.