A rigid circular loop of radius r and ma...

A rigid circular loop of radius `r` and mass `m` lies in the `XY-` plane of a flat table and has a current `I` flowing in it. At this particular place. The Earth's magnetic field `vec(B)=B_(x)i+B_(z)k`. The value of `I` so that the loop starts tilting is `:`

`(mg)/(pirsqrt(B_(x)^(2)+B_(2)^(z))`

`(mg)/(pirB_(z))`

`(mg)/(pirB_(x))`

`(mg)/(pirsqrt(B_(x)B_(z)))`

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