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[" Three rings,each having equal radius "R" ,are placed "],[" mutually perpendicular to each other and each "],[" having its centre at the origin of co-ordinate system."],[" If current I is flowing through each ring then the "],[" magnitude of the magnetic field at the common "],[" centre is "],[[" (A) "sqrt(3)(mu_(0)I)/(2R)," (D) "(sqrt(3)-sqrt(2))(mu_(0)I)/(2R)],[" (C) "(sqrt(2)-1)(mu_(0)I)/(2R)," (D) "(sqrt(3)-sqrt(2))(mu_(0)I)/(2R)]]

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