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Principle of superposition Principle of superposition :- The force is a two body interaction, i.e., electrical force between two point charges is independent of presence or absence of other charges and so the principle of superposition is valid, i.e., “force on a charged particle due to number of point charges is the resultant…
Numerical on Coulomb’s Law Numerical : – Example 1. Find out the electrostatics force between two point charges placed in air (each of +1 C) if they are separated by 1m . Example 2. Two particles having charges q1 and q2 when kept at a certain distance, exert a force F on each…
COP(Heat Pump)=COP(Refrigerator)+1 Heat PUmp: Heat pump is a device that transfers heat from a colder area to a hotter area by using mechanical energy, as in a refrigerator. In heat pump how much heat is rejected at higher temperature is an important quantity. Coefficient of performance of Heat Pump ⇒ ∴ ……….(1) Refrigerator:…
Coulomb’s Law Coulomb’s Law :- On the basis of experiments, Coulomb established the following law known as Coulomb’s law. The magnitude of electrostatic force between two point charges is (i) directly proportional to the product of charges and (ii) inversely proportional to the square of the distance between them. i.e. and ⇒…
Methods of Charging of a body The different methods of Charging of a body are :- (a) friction, (b) conduction, (c) induction, (d) thermionic ionization or thermionic emission (e) photoelectric effect and (f) field emission. (a) Charging by Friction : When a neutral body is rubbed against other neutral body then some electrons…
Properties of Electric Charge Properties of Electric Charge :- (i) Charge is a scalar quantity : It adds algebraically and represents excess, or deficiency of electrons. (ii) Charge is of two types : (a) Positive charge and (b) Negative charge Charging a body implies transfer of charge (electrons) from one body to another….
Electric Charge Charge of a material body or particle is the property (acquired or natural) due to which it produces and experiences electrical and magnetic effects. Some of naturally charged particles are electron, proton, α-particle etc. Charge is a derived physical quantity. The S.I. unit of Charge is coulomb. In practice we use…
Difference between Heat Engine Heat Pump and Refrigerator In this article we are going to have detailed study of difference between Heat Engine Heat Pump and Refrigerator. Heat Engine: Heat engine is a device which converts heat energy into mechanical work. In heat engine how much work is extracted from a given amount of heat…
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DIMENSIONS Dimensions of a physical quantity are the powers (or exponents) to which the base quantities are raised to represent that quantity. 1. Dimensional formula :- Dimensional formula of any physical quantity is that expression which represents how and which of the base quantities are included in that quantity. It is written by…
System of Units System of Units :- A system of units is the complete set of units, both fundamental and derived, for all kinds of physical quantities. The common system of units which is used in mechanics are given below :- (a) CGS or Gaussian system In this system the fundamental quantities are…
