A long solenoid 200 turns// cm and carri...

A long solenoid `200 turns// cm` and carries a current `I`. The magnetic field at its centre is `6.28 xx 10^-2 wbm^(-2)` .Another long solenoid has `100 turns//cm`. and it carries a current `I//3`. The value of the magnetic field at is centre is

`1.05xx10^(-2) wbm^(-2)`

`1.05xx10^(-5) wbm^(-2)`

`1.05xx10^(-3) wbm^(-2)`

`1.05xx10^(-4) wbm^(-2)`

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