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A long solenoid with 10 turn / cm and a...

A long solenoid with 10 turn / cm and a radius of 7.0 cm carries a current of 20.0 mA .A current of 6.0 A exists in a straight conductor loacted along the central axis of the solenoid at what radial distance from the axis will the direction of the magneitic field be at `45^(@)` to the axial direction

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The correct Answer is:
`(a)2.27cm;(b)6.22xx10^(-5)T`
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