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A solenoid of 2m long & 3cm diameter has...

A solenoid of 2m long & 3cm diameter has 5 layers of winding of 500 turns per metre length in each layer & carries a current of 5A. Find intensity of magnetic field at the centre of the solenoid.

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For long solenoid at the centre `B=mu_(0)ni`
`H=B/(mu_(0))=ni=(500)5xx5=1.25xx10^(4)A//m`
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