Explain why, when we blow air in the space between two inflated balloons (carring a little water each) and hanging about 10 cm apart on a stick, the two balloons come closer.

While teaching the topic on 'Air' , an EVS teacher wanted to demostrate that air has weight and occupies space. Her colleague suggested the following four different activities for this purpose to her. A.Place an empty inverter beaker on the surface of the water and start pressing it down. B. Such the juice through a straw C. Blow air in a balloon. D. Tie two inflated balloons to a rod and establish equilibrium . Then, puncture one of the balloons. Which of the above activities will lead to demonstrating the desired result ?

The force of attraction between two balls each of mass 1 kg when their centres are 10 cm apart is ……..

What is the force between two small charged of 2 xx 10^(-7) C placed 30 cm apart in air?

What is the force between two small charged spheres having charges of 2xx10^(-7)C and 3xx10^(-7) C placed 30cm apart in air ?

The force between two small charged spheres having charges of 1xx10^(-7)C and 2xx10^(-7)C placed 20 cm apart in air is

Two positive point charges of 12 and 5 microcoulombs, are placed 10 cm apart in air. The work needed to bring them 4 cm closer is

A parallel plate air capacitor is made using two plates 0.2 m square , spaced 1 cm apart . It is connected to a 50V battery. (a) what is the capacitance ? (b) what is the charge one each plane ? (c) what is energy stored in the capacitor ? (d) what is the electric field between the plates ? (e) If the battery is disconnected and then the plates are pulled apart to a separation of 2 cm , what are the answer to the above parts ?