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प्रश्न
What happens to the magnetic field at the centre of a circular current-carrying coil if we double the radius of the coil keeping the current unchanged?
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उत्तर
The magnetic field at the centre of the circular coil, B = `(mu_0"I")/(2"r")`. Hence, if we double the radius, the magnetic field at the centre of the coil will become half its original value.
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