An electroscope is a simple device consisting of a metal ball that is attached by a conductor to two thin leaves of metal foil protected from air disturbance in a jar. when the ball is touched by a charged body, why do the leaves that normally hang straight down spread apart?
1. none of these
2. the charge transfers to the leaves through the metal ball. since the leaves have the same charge, they are pushed away from each other.
3. the charge transfers to the leaves through the glass. since the leaves have different charges, they are pushed away from each other.
4. the charge transfers to the leaves through the metal ball. since the leaves have different charges, they are pushed away from each other.
5. the charge transfers to the two leaves through the glass. since the leaves have the same charges, they are pushed away from each other

2. The charge transfers to the leaves through the metal ball. Since the leaves have the same charge, they are pushed away from each other.

Explanation:

As we know that two similar charges always repel each other and two opposite charges always attracts each other

So here we know that when a charged body is in contact with the metal ball then we know that metal is good conductor so through this metal ball charge is transferred to the the thin metal plates

Now this metal plate will separate by mutual repulsion force on them and they moved apart

So correct answer will be

2. The charge transfers to the leaves through the metal ball. Since the leaves have the same charge, they are pushed away from each other.

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

v 154.9= 0.9 length length s little over 154.9cm