10 physics curul static and current electricity understand section 4.1 charges in nature distinguish between the two types of electric charges show that theal charge in an isolated system is conserved conservation of energ conservation of char and how to use conservation of charge to calculate quantities of charge transferred between objects and know types of electric charges are two types and positive charges negative charges are protons they has positive charges they are electrons they have negative posi charge negative charge okay therefore if a particle is chared and partic when there is unbalanced protons and electrons within the particle will positive and negative charges are present in neutral objects for the number 1 2 3 4 5 6 7 8 9 and 10 and the number of electrons 1 2 3 4 5 6 7 8 9 10c they are not charged am same amounts of negative and positive charge neutralize each other and there is no Char there is okay if there is a little bit more of one type of charge than the other then the object is said to be electrically charged if an object gains electrons and object if an object ELR it becomes negatively charged because comparing Toons as they are negatively charged elements and if it loses electrons it becomes positively charged yeah fore okay of charge so the unit of electric charge is colum yeah electric chargeit is called Colum and colum of charge is carried by 6.25 much 1.6 * 10^ minus 19 colums and electron for examp m 1 1 * about conservation of charges law of conservation of charge it states that the total amount of electric charge in a closed system must remain constant for chares are neither created nor destroyed but are transfer from one material to foree fore spe the number of electr 1 2 3 four and five for Fore spech fore the total charge in an isol system never changes only transferred only trans so is isol means no particles are allowed to cross the boundary of the system this number number positive and negative charges present at any time does not change 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 again 1 2 3 4 5 6 7 8 8 + 4 12 foree foreign spee how to quanti energy means quantization of charges the magnitude of this charge is denoted by the letter [Music] e it is quantied when it occurs as the integ it is true for both negative which is electr and positive which Ison charges where n is positive or negative integer n should have to be integer value negative thee of the charge have values inmal plus e or minus E plus 2 e or minus 2 e the magnitude of the charge have to be in E so which isge which is an integer value again which is an integer value the same for Z negative charged matter which are impossible in Normal matter plus 2.5 e or minus 1.5 e 2.5 is not an integer value it is rational number for exercise 4.1 exercise 42 41 okay excise 41 when do you say that a body is charged positively and body positively charged okay answer POS when there are more protons than electron then the object will be positively charged so this object will be neutral the number of electr the number of so the number of the number of electr are postively Char the number of protons are much greater than the number of [Music] electr exercise 4.2 a conductor processes a positive charge of c.2 * 10us 19 cols as a given charge 3.2 * 10us again how many electrod does it have in excess or defat use eal okay 1.6 10 col is given how many electrons does it have in excess or defeat which is okay6 * 19 1.6 * 10 19 the number of in terms of so Q 3.2 * 19 e and z this one by this one cancel out 3.2 over 1.6 sorry POS so how many electrons does it have in excess [Music] that means assume this is the conductor so the number of electrons how many El the number of electr would be the number of electrons would be [Music] deficit the number of electrons are by how many [Music] okay questions question number what are the different types of charges that exist in nature okay answer charges comes in two main types and positive charges negative charges question number two when do you say that a body is negatively charged okay answer when a body gains electrons it becomes negatively charged and object body for the number of el charges are much much more greater than the number of positive charges which are the protons okay question number three what does the law of conservation of charge say law of conservation of charge okay answer state that the total amount of electric charge in a closed system must remain constant constant the amount of electric charge in a closed the net charge of an isol system will always remain constant or the is this means that any system that is not exchanging mass or energy with surrounding will never have a different total charge at any two times so at any two times and before charging after charging total Char parles okay question number four what does it mean by quantization of charge quantization of charge answer it indicates that charge can always be the integral multiple of charge of an electron so the number of charge times e so charge can assume only certain disc values am only have to be only certain if the charge of a body is not the integ mple of the charge of the electr then one can get integer value for the number of el which is not possible practically should have to be put at a certain discrete values okay question number five write the properties of electri charges charge answer individual electric charge just could ALB sum total charge the sum of amount of chares charges are always conserved charge can be quantized by using this formula charge is a SC quantity charge is transferable Char trans they transfer from one body to another like charges rep each other and unlike charges attract each [Music] other Char is always associated with Mass for SI unit of electric charge a what B colum C ampere topic section 4.2 matters of charging a body speech fore foreign speech welcome