Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1,2), (2,4) and (4,1) show e

English

Gujarati

Hindi

1. Electric Charges and Fields

normal

Five balls numbered $1$ to $5$ are suspended using separate threads. Pairs $(1,2), (2,4)$ and $(4,1)$ show electrostatic attraction while pairs $(2,3)$ and $(4,5)$ show repulsion. Therefore ball $1$ must be

positively charged

made of metal

neutral

$B$ and $C$ both

Solution

It should be neutral because $2,$ and 4 show attraction means have opposite charge 2 too show attraction with 1 means 1 and 4 should have same charge but as they are showing attraction too then. 1 should be electricity neutral. Besides, it can be seen that ball 2 is positively charged then ball 4 is negatively charged because 2 and 4 show attraction. Now ball if ball 2 is $(+v e)$ charged then ball 3 is also $(+v e)$ charged because 2 and 3 also show repulsion and similarly ball 5 is $(-v e)$ charged because ball 4 and 5 show repulsion and we left with ball 1 and it never be $(+v e)$ by charged because ball 2 and 1 show attraction it means ball 1 is negatively charge but it is also not possible because ball 1 and 4 also show attraction and in the end we know that ball 1 is nor be positively or neither be negatively charge. It means be ball 1 have no charge so it must be neutral.

Standard 12

Physics

Two conducting spheres of radii $r_1$ and $r_2$ have same electric fields near their surfaces. The ratio of their electric potentials is

normal

Three charges $2q,\, – q,\, – q$ are located at the vertices of an equilateral triangle. At the centre of the triangle

normal

A parallel plate condenser with plate area $A$ and separation $d$ is filled with two dielectric materials as shown in the figure. The dielectric constants are $K_1$ and $K_2$ respectively. The capacitance will be

normal

Two capacitor one of capacitance $C$ and other capacitance $C/2$ are connected with a battery of $V$ $volt$ then heat produced in connecting wire

normal

A thin spherical conducting shell of radius $R$ has a charge $q$ . Another charge $Q$ is placed at the centre of the shell. The electrostatic potential at a point $P$ at a distance $R/2$ from the centre of the shell is

normal

Five balls numbered $1$ to $5$ are suspended using separate threads. Pairs $(1,2), (2,4)$ and $(4,1)$ show electrostatic attraction while pairs $(2,3)$ and $(4,5)$ show repulsion. Therefore ball $1$ must be

Solution

Similar Questions

Two conducting spheres of radii $r_1$ and $r_2$ have same electric fields near their surfaces. The ratio of their electric potentials is

Three charges $2q,\, – q,\, – q$ are located at the vertices of an equilateral triangle. At the centre of the triangle

A parallel plate condenser with plate area $A$ and separation $d$ is filled with two dielectric materials as shown in the figure. The dielectric constants are $K_1$ and $K_2$ respectively. The capacitance will be

Two capacitor one of capacitance $C$ and other capacitance $C/2$ are connected with a battery of $V$ $volt$ then heat produced in connecting wire

A thin spherical conducting shell of radius $R$ has a charge $q$ . Another charge $Q$ is placed at the centre of the shell. The electrostatic potential at a point $P$ at a distance $R/2$ from the centre of the shell is

Start a Free Trial Now