A long solenoid has 200 turns per cm and carries a current i. The magnetic field at its centre is 6.28 × 10–2 weber/m2. Another long solenoid has 100 turns per cm and it carries a current i/3. The value of the magnetic field at its centre is
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I don't know sorry for your answer friend
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Answer: B2=(pi)/3=1.04
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