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A long solenoid is fabricated by closely winding a wire of radius 0.5mm over a cylindrical nonmagnetic frame

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A long solenoid is fabricated by closely winding a wire of radius 0.5mm over a cylindrical nonmagnetic frame so that the successive turns nearly touch each other. What would be the magnetic field B at the centre of the solenoid if it carries a current of 5A?

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r = 0.5mm, i = 5A, B = μ0ni (for a solenoid)

Width of each turn = 1mm = 10–3m

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Width 1mm kaise aaya
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Diameter matlab width , so , d=2r , therefore , d= 2×1.5=1mm
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