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A solenoid 50cm long has 4 layers of win...

A solenoid `50cm` long has 4 layers of windings of `350` turns each. The radius of the lowest layer is `1*4cm`. If the current carried is `6*0A`, estimate the magnitude of magnetic flux density (i) near the centre of the solenoid on its axis, (ii) near the ends on its axis, (iii) outside the solenoid near its centre.

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