The length of solenoid is \( 0.1 \mathrm{~m} \). and its diameter i...

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The length of solenoid is \( 0.1 \mathrm{~m} \). and its diameter is very small. A wire is wound over it in two layers. The number of turns in inner layer is 50 and that of outer layer is 40 . The strength of current flowing in two layers in opposite direction is 3A. Then find magnetic induction at the middle of the solenoid.
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