[" A small ball of paper has mass "9times10^(-5)kg" and "],[" carries a charge of "5 mu C" .When it is held over "],[" another charged ball of paper at a distance of "],[2cm" above it,the two balls stay in equilibrium."],[" What is the charge on the second ball? "]

A small ball of paper has mass 9xx10^(-5) kg and carries a charge of 5muC . When it is held over another charged ball of paper at a distance of 2cm above it, the two balls stay in equilibrium. What is the charge on the second hall ?

A pith ball of mass 9 xx 10^(-5) kg carries a charge of 5muC . What must be charge in another pith ball placed directly 2 cm above the given pith ball such that they held in equilibrium?

A pith ball of mass 9 xx 10^(-5) kg carries a charge of 5muC . What must be charge in another pith ball placed directly 2 cm above the given pith ball such that they held in equilibrium?

A pith-ball A of mass 9xx10^(-5) kg carries a charge of 5 mu C. What must be the magnitude and sign of the charge on a pith-ball B held 2 cm directly above the pith-ball A, such that the pith-ball A remains stationary ?

A pith-ball A of mass 9xx10^-5 kg carries a chargeof +5muc . What must be the magnitude and sign of the charge on a pith-ball B held 2 cm directly above the pith-ball . A such that the pith-ball. A remains stationary?

The mass of a ball if four times the mass of another ball. When these balls are separated by a distance of 10 cm, the gravitational force between them is 6.67xx10^(-7)N . Find the masses of the two balls.

A small positively charged ball of mass m is suspended by an insulating thread of length L. This ball remains in equilibrium with string horizontal when another small charged ball is placed exactly at a distance L below the point of suspension of the first ball. The second ball is slowly moved away from the first ball to a far away point. (The second ball is moved horizontally so that the first ball does not accelerate). As a result the first ball lowers down to the original position of the second ball and the string become vertical. Find the work done by the external agent in removing the second ball.