The average radius of an air cored made ...

The average radius of an air cored made toroid is 0.1 m and it has 500 turns. If it carries 0.5 ampere current, then the magnetic field inside it is :

`5 xx 10^(-4)`

` 5 xx 10^(-3)`

` 5 xx 10^(-2)`

`2 xx 10^(-3)`

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