in a gold leaf electroscope, it happens that when we put a positive object at the metal cap the 2 gold leaf deflects but when a negetive object is placed, it attracts. But it is also stated that when a positive object is placed its charge goes to the 2 gold leafs and it deflects but in case of negative too both the gold leaf gets negetive charge but they attract why? please explain briefly.

I want  complete notes on the chapter friction 

In my book subtopics are:

Friction 

Types of friction 

Factors affecting friction 

Methods of reducing friction 

Methods of increasing friction 

Advantages and disadvantages of friction 

Some real life based situation where friction is applied.

How to make a monomer into polymer if it is an addition polymer example

This planet, _______ is yellowish in colour and has many rings and satellites.

A. Uranus

B. Jupiter

C. Neptune

D. Saturn

Pasteurized milk does not need to be boiled. Why?

Write the $pH$ value of the

1. Saliva (before meal)

2. Saliva (after meal)

3. Lemon juice

4. Colourless aerated drink

5. Carrot juice

6. Coffee

7. Tomato juice

8. Tap water