Which of the following can be determined by using a Hall crystal?

1.	Which of the following can be determined by using a Hall crystal?
A.	Only 1 and 2
B.	1, 2 and 4
C.	Only 3 and 4
D.	Only 2 and 4
Answer» B. 1, 2 and 4

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Which of the following can be determined by using a Hall crystal?

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