Magnetic Field at Square Loop Center (Jee Mains)

Biot-Savart and Ampere's Law

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Magnetic Field at Square Loop Center

Figure shows a current carrying square loop ABCD of edge length is 'a' lying in a plane. If the resistance of the ABC part is r and that of ADC part is 2r, then the magnitude of the resultant magnetic field at centre of the square loop is

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