What is the magnetic field strength at the surface of a 25mm diameter – McqOptions

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1.	What is the magnetic field strength at the surface of a 25mm diameter bar as compared to that at the surface of a 50mm diameter bar, each carrying 1000 amps of current?
A.	Twice
B.	One half
C.	One quarter
D.	Four times
Answer» B. One half

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