The length of a solenoid is \( 0.20 \mathrm{~m} \). Its radius is \...

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The length of a solenoid is \( 0.20 \mathrm{~m} \). Its radius is \( 0.01 \) \( \mathrm{m} \) and it has \( 120 \) turns. The magnitude of the magnetic field at a point on the axis in its interior, if a current of \( 2.5 \mathrm{~A} \) is flowing through it, is
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