Two positively charged spheres of masses $m_1$ and $m_2$ , are suspended from a common point at the ceiling by identical insulating massless strings of length l. Charges on the two spheres are $q_1$ and $q_2$ , respectively. At equilibrium both strings make the same angle $\theta$ with the vertical. Then

Q.

Two positively charged spheres of masses $m_1$ and $m_2$ , are suspended from a common point at the ceiling by identical insulating massless strings of length l. Charges on the two spheres are $q_1$ and $q_2$ , respectively. At equilibrium both strings make the same angle $\theta$ with the vertical. Then

Q. Two possitively charged spheres of masses $m_1$, and $m_2$, are suspended from a common point at the ceiling by identical insulating mass-less strings of length I. Charges on the two spheres are $q_1$ and $q_2$, respectively. At equilibrium both strings make the same angle $\theta$ with the vertical. Then :

Q. Two small spheres have mass $m_1$ and $m_2$ and hanging from massless insulating threads of lengths $l_1$ and $l_2$. Two spheres carry charges $q_1$ and $q_2$ respectively. The spheres hang such that they are on the same horizontal level and the threads are inclined to the vertical at angle ${\theta }_1$ and ${\theta }_2$ respectively. If $F_1=F_2$, then:

Q. Two small spheres, each with a mass of 20 g, are suspended from a common point by two insulating strings of length 40 cm each. The spheres are identically charged and the separation between the balls at equilibrium is found to be 4 cm. Find the charge on each sphere.

Q. Two small spheres of masses $M_1$ and $M_2$ are suspended by weightless insulating threads of lengths $L_1$ and $L_2$, the spheres carry charges $Q_1$ and $Q_2$ respectively. The spheres are suspended such that they are in level with another and the threads are inclined to the vertical at angles of ${\theta }_1$ and ${\theta }_2$ as shown, which one of the following conditions is essential, if ${\theta }_1={\theta }_2:$