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A closely wound solenoid 80 cm long has ...

A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A. estimate the magnitude of B inside the solenoid near its centre.

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`l = 80 cm = 80 xx 10 ^(-2) m, N = 400 xx 5, l = 8 A . ` Now `B = ( mu _(0) NI )/(l) = ( 4pi xx 10 ^(-7) xx 400 xx 5 xx 8)/( 80 xx 10 ^(-2)) = 8pi xx 10 ^(-3) T`
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