To avoid the effect of stray magnetic field in A.C. bridges we can us

1.	To avoid the effect of stray magnetic field in A.C. bridges we can use
A.	magnetic screening
B.	Wagner earthing device
C.	wave filters
D.	any of the above
Answer» B. Wagner earthing device

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To avoid the effect of stray magnetic field in A.C. bridges we can use

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