Why two or more mercury drops form a single drop when brought in contact with each other ?

Two brass sphere of radii 5 cm and 10 cm are brought in contact with each other. Find the centre of gravity of the combination.

If two convex lenses of focal lengths 10 cm and 5 cm are kept in contact with each other , What is their combined focal length ?

Two drops of a liquid are merged to form a single drop . In this process,

A metallic sphere A isolated from ground is charged to + 50 mu C . This sphere is brought in contact with other isolated metallics sphere B of half the radius of sphere A.The charge on the two sphere will be now in the ratio.

Why equipotential surface will not intersect with each other ?

Name the types of force experienced by charged objects when they are brought close to each other.

True or false When a live wire and a neutral wire come in contact with each other,it may cause short circuit

Two thin converging lenses of focal length 15 cm and 30 cm are held in contact with each other. The focal length of the combination is

Fill in the blanks : If two lenses with focal lengths 10cm and 20 cm respectively are kept in contact with each other , the effective power of the combination is ………….