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A closely wound, circular coil with radi...

A closely wound, circular coil with radius `2.40 cm` has 800 turns.
(a) What must the current in the coil be if the magnetic field at the centre of the coil is`0.0580 T`?
(b) At what distance `x` from the centre of the coil, on the axis of the coil, is the magnetic field half its value at the centre?

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