Let BP and BQ be the magnetic field produced by the wire P and Q which are placed symmetrically in a  rectangular loop ABCD as shown in figure. Current in wire P is I directed inward and in Q is 21 directed outwards. If A B B Q · d l = 2 µ 0 tesla meter, D A B P · d l = - 2 µ 0 tesla meter & A B B P · d l = - µ 0 tesla meter the value of I will be:


(A) 8 A                    (B) 4 A                  (C) 5 A                    (D) 6 A

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