Our hands become warm when rubbed against each other. Explain.

The objective and eye pieces used in a compound microsciope are not single lenses but are the combinations of more than one lenses placed in contact with each other. Explain why?

Nitric oxide becomes brown when released in air. Explain why ?

Can two balls having same kind of charge on them attract each other? Explain.

Both antacids and antiallergic drugs are antihistamines but they cannot replace each other. Explain why?

Utensils made up of copper and brass become shiny when rubbed with lemon? Why?

Frictional electricity The electricity developed in bodies when they are rubbed with each other is called frictional electricity. There are two kinds of charges, namely positive and negative. Like charges repel each other and unlike charges attract each other. when a glass rod is rubbed with silk cloth, glass rod becomes positively charged are silk acquires the same amount of negative charge. the concept of positive and negatice charges was introduced by Benjamin Franklin. The charge is always quantised and conserved in a system. The number of electrons for one coulomb of charge is

Frictional electricity The electricity developed in bodies when they are rubbed with each other is called frictional electricity. There are two kinds of charges, namely positive and negative. Like charges repel each other and unlike charges attract each other. when a glass rod is rubbed with silk cloth, glass rod becomes positively charged are silk acquires the same amount of negative charge. the concept of positive and negatice charges was introduced by Benjamin Franklin. The charge is always quantised and conserved in a system. A body can be negatively charged by