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Q)

A long solenoid has 200 turns per cm and carries a current $i$. The magetic field at its centre is $6.28 \times 10^{-2}weber/m^2$. Another long solenoid has 100 turns per cm and it carries a current $i/3$. The value of the magnetic field at its current is :


( A ) $1.05 \times 10^{-3} weber/m^2$
( B ) $1.05 \times 10^{-2} weber/m^2$
( C ) $1.05 \times 10^{-4} weber/m^2$
( D ) $1.05 \times 10^{-5} weber/m^2$

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