Two identical coils carrying equal currents have a common center and their planes are at right angles to each other. Find the ratio of the magnitudes of the resultant magnetic field at the center and the field due to one coil alone.
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D
The magnitude of the resultant magnetic field at the common center of coil is given as 

The ratio of the magnitude of the resultant magnetic field at the common center and the magnetic field due to one coil alone at common center.

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