A circuit coil of radius 20 cm and 20 tu...

A circuit coil of radius 20 cm and 20 turns of wire is mounted vertically withits plane in the magnetic meridian. A small magnetic needle placed at the center of the coil is deflected through `45^(@)` when a current is passed through the coil. What is the value of the current? (horizontal induction of earth's field = `3.6xx10^(-5)Wb//m^(2)`

`17/(10pi)A`

`6A`

`6xx10^(-3)A`

`3/50A`

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