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A Helmholtz Coil with R = 5cm is a pair of coils with the same co-axial...

A Helmholtz Coil with R = 5cm is a pair of coils with the same co-axial separation as radius. What is the magnitude of the magnetic field at the center of the Helmholtz Coil with a pair of 500 turn coils with a 15 A of current?

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