There are 2 long parallel conductors AB and CD. AB carries 4A current – McqOptions

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1.	There are 2 long parallel conductors AB and CD. AB carries 4A current and CD carries 3A current. The magnetic field at the midpoint of these 2 conductors is B. If 4A current is switched off, then what is the magnetic field at the midpoint now?
A.	( frac {B}{3} )
B.	( frac {2B}{3} )
C.	B
D.	3B
Answer» E.

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