A rigid circular loop of radius \( r \) and mass \( m \) lies in the \( X Y \)-plane on a flat t...

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A rigid circular loop of radius \( r \) and mass \( m \) lies in the \( X Y \)-plane on a flat table and has a current \( i \) flowing in it. At this particular place, the earth's magnetic field is \( \mathbf{B}=B_{x} \hat{\mathbf{i}}+B_{z} \hat{\mathbf{k}} \). The value of \( i \) so that the loop starts tilting is
\( P \)
(a) \( \frac{m g}{\pi r \sqrt{B_{x}^{2}+B_{z}^{2}}} \)
(b) \( \frac{m g}{\pi r B_{x}} \)
(c) \( \frac{m g}{\pi r B_{z}} \)
(d) \( \frac{m g}{\pi r \sqrt{B_{x} B_{z}}} \)
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