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In the fig. Shown a coil of single two is wound on a sphere of radius R and mass m. The plane of the coil is parallel to the lane and lies in the equitorial Plane of the sphere. current in the coil is i. The value of B if the sphere is in equilibrium is

 

 

Option: 1

\frac{m g \cos \theta}{{ \pi iR }}


Option: 2

\frac{m g}{\pi i R}


Option: 3

\frac{m g \tan \theta}{\pi i R}


Option: 4

\frac{m g \sin \theta}{\pi i R}


Answers (1)

best_answer

\begin{aligned} & m g \sin \theta=f \\ & f \cdot R=i \pi R^2 B \sin \theta \\ & m g \sin \theta \cdot R=i \pi R^2 B \sin \theta \\ & B=\frac{m g}{i \pi R} \end{aligned}

 

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