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20. Inree rings, each having equal radiu...

20. Inree rings, each having equal radius R, are placed mutually perpendicular to each other and each having its centre at the origin of co-ordi- nate system. If current I is flowing through each ring then the magnitude of the magnetic field at the common centre is y (B) zero (A) V3 la (C) (V2 - 1) Like (D) (13 - 13 concentric ceila yad V

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