Which of the following must not be done to maintain the magnetic field – McqOptions

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1.	Which of the following must not be done to maintain the magnetic field over the sample uniform in space and time?
A.	Large pole pieces need to be used
B.	Pole faces must be polished
C.	Wide pole gap must be present
D.	Magnets can be permanent or electromagnet
Answer» D. Magnets can be permanent or electromagnet

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