A current of (1)/(4pi) A is flowing thro...

A current of `(1)/(4pi)` A is flowing through a toroid. It has 1000 number of turns per meter then value of magnetic field (in `Wb//m^(2)`) along its axis is

`10^(-2)`

`10^(-3)`

`10^(-4)`

`10^(-7)`

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