Law of Gravitation

Q. Two long current carrying thin wires, both with current $I$, are held by insulating threads of length $L$ and are in equilibrium as shown in the figure, with threads making an angle ${}^{\prime }{\theta }^{\prime }$ with the vertical. If wires have mass $\lambda$ per unit length then the value of $I$ is
($g$ = gravitational acceleration)

1. $2\sqrt{\frac{\pi gL}{{\mu }_o}\tan \theta }$
2. $\sqrt{\frac{\pi \lambda gL}{{\mu }_o}\tan \theta }$
3. $\sin \theta \sqrt{\frac{\pi \lambda gL}{{\mu }_o\cos \theta }}$
4. $2\sin \theta \sqrt{\frac{\pi \lambda gL}{{\mu }_o\cos \theta }}$

Q. Two long current carrying thin wires, both with current $I$, are held by insulating threads of length $L$ and are in equilibrium as shown in the figure, with threads making an angle ${}^{\prime }{\theta }^{\prime }$ with the vertical. If wires have mass $\lambda$ per unit length then the value of $I$ is
($g$ = gravitational acceleration)

1. $2\sqrt{\frac{\pi gL}{{\mu }_o}\tan \theta }$
2. $\sqrt{\frac{\pi \lambda gL}{{\mu }_o}\tan \theta }$
3. $\sin \theta \sqrt{\frac{\pi \lambda gL}{{\mu }_o\cos \theta }}$
4. $2\sin \theta \sqrt{\frac{\pi \lambda gL}{{\mu }_o\cos \theta }}$