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Two small spheres of masses M(1)and M(2)...

Two small spheres of masses `M_(1)`and `M_(2)` are suspended by weightless insulating threads of lengths `L_(1)` and `L_(2)`. The speres carry charges `Q_(1)` and `Q_(2)` respectively. The spheres are suspended such that they are in level with one another adn the threads are inclined to the verticle at angles `theta_(1)` and `theta_(2)`respectively . Which one of the following conditions is essential for `theta_(1) = theta_(2)` ?

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