Question

Part 1. Exercise Questions (Have to be submitted ) State Coulomb's law and give the mathematical expression. b) Write the definition of electric field strength. What is its SI unit? (Use your own words). c) Define electric displacement vector. What is its SI unit? i.Does the electric displacement vector due to a given charge distribution depend on the properties of the medium? Does the electric field intensity due to a given charge distribution depend on the properties of the medium?? ii. d) State Gauss's law and give the mathematical expression. e) Derive the first equation of Maxwell's equations. f) Under which condition Gauss's law provide an easy means of finding E or D? g) Under which condition Coulomb's law must be resorted to determine E or D? h) Define the electric potential and give the relationship between electric potential and i) j) electric field. Define the energy density in electrostatic fields and give the expression. Define and give both the expressions and SI units (if it is available) of following The current ii. The current density i. The convection current iv. The conduction current Note That: Use your own words. k) Write the definition of dielectric constant. l) Write down the definition of linear and isotropic and homogenous dielectric materials MIDDLE EAST TECHNICAL UNIVERSITY NORTHERN CYPRUS CAMPUS Department of Electrical and Electronics Engineering m) Write the boundary conditions of following 1, dielectric (e1 ) and dielectric (?2) ii conductor and dielectric iii. conductor and free space n) What is the conductivity of the material? What is its SI unit?

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Answer 1

Coulomb's law States that: The magnitude of the electric force of attraction (or) repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely Proportional to the squares of the distance between them F = Ke q_1 q_2/r^2 Where Ke = Coulomb's constant Ke = 8.9875 times 10^9 N m^2 c^-2 q_1 q_2 is calar r is the distance between the charges. rightarrow The force of the interaction between the charges is attractive if the charges have opposite signs. (F is -ve) and repulsive if like - signed (F is +ve) \r\n bA) Electric field strength is a quantitative expression of the intensity of an Electric field at a particular location. rightarrow the standard unit is the Volt/meter V/m (or) V^-1 CA) The electric displacement field, denoted by D, is a Vector field that appears in Maxwell's equations. It accounts for the effects of