Question

On rubbing a glass rod with silk cloth, what type of charge is generated in (a) silk cloth (b) glass rod

Answer 1

Hint: Charge is also called electric charge .Charge is represented by q. Its SI unit is coulomb. Here using charge, the basic concept of attracting and repelling of charges we can describe what kind of charge is generated. There is a principle of conservation of charge which states that in an isolated system, charge can neither be created nor be destroyed.

Complete step-by-step solution:
Study of charges which are at rest is called Electrostatics. Charge is a scalar quantity; scalar quantities are those which have only magnitude and no direction. There are two types of charges, the first is positive charge and second is negative charge. Like charges repel each other and unlike charges attract each other, these are called law of charges, which was discovered by AUGUSTIN D COULOMB. Basic property of charges is electrons, protons and other subatomic particles. Electrons are negatively charged and protons are positively charged. When electron and proton came together they form atom. Object which have equal number of electron and proton are neutral. There is a difference between mass and charge which is charge is negative as well as positive whereas mass is always positive.
Coulomb’s law describe how strongly charges pull or push each other. Using 3 ways any object can be charged that are charging by friction, charging by contact, and charging by induction. Properties of charges are it can be attractive or repulsive, charge is of additive nature, charge is invariability means charge on a body does not depend upon its state of motion or rest and charge on a body is integral multiple of charge on a single electron which is called quantisation of charge that is:
\[q=ne\]
Where
\[n=1,2,3,....\]
When a glass rod is rubbed with silk, glass tends to lose electrons and silk captures electrons from the glass atoms. So after rubbing, the glass becomes positively charged and the silk becomes negatively charged.Thus, opposite and equal charges are produced on the both.

Note:Electricity influences the way our heartbeats .but electrical generators can influence hearth’s rhythm .Electric waves cause our heart muscles to contract. Birds don’t get electrocuted sitting on power lines. Human body is an excellent conductor of electricity.