1.

Two equal electric currents are flowing perpendicular to each other as shown in the figure. AB and CD are perpendicular to each other and symmetrically placed with respect to the current flow. Where do we expect the resultant magnetic field to be zero?     

A. on AB          
B. on CD             
C. on both AB and CD      
D. on both OD and BO   
Answer» B. on CD             


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