Diode Current Equation
Single Phase Transformer
What is Electric Field?
Static Electric Field | Electrostatic Induction | Electric Field Strength
What is Flux? Types of Flux?
Magnetic Field and Magnetic Circuit | Magnetic Materials
Energy Stored in a Magnetic Field
A Current Carrying Conductor Within A Magnetic Field
Hard Magnetic Materials
Soft Magnetic Materials
Magnetic Circuit with Air Gap
Electrical International Symbol
Questions on Capacitor
Questions on Magnet Field
Electric Current and Theory of Electricity | Heating and Magnetic Effect
Nature of Electricity
Drift Velocity Drift Current and Electron Mobility
Electric Current and Voltage Division Rule
RMS or Root Mean Square Value of AC Signal
Voltage or Electric Potential Difference
Safety Rules for Medium Voltage Installation
Voltage Drop Calculation
Electrical Conductance Conductivity of Metal Semiconductor and Insulator | Band Theory
Properties of Electric Conductor
Electrical Resistance and Laws of Resistance
Electric Circuit and Electrical Circuit Elements
Series Parallel Battery Cells
Electrical DC Series and Parallel Circuit
RL Series Circuit
Three Phase Circuit | Star and Delta System
RL Parallel Circuit
RL Circuit Transfer Function Time Constant RL Circuit as Filter
Construction of AC Circuits and Working of AC Circuits
Series RLC Circuit
Parallel RLC Circuit
Resistances in Series and Resistances in Parallel
Resonance in Series RLC Circuit
Planar and Non Planar Graphs of Circuit
Types of resistor Carbon Composition and Wire Wound Resistor
Varistor Metal Oxide Varistor is nonlinear Resistor
Carbon Composition Resistor
Wire Wound Resistor
Variable Resistors | Defination, Uses and Types of Variable Resistors
Light Dependent Resistor | LDR and Working Principle of LDR
What is Capacitor and Capacitance? Types of Capacitors
Working Principle of a Capacitor
Energy Stored in Capacitor
Quality Factor of Inductor and Capacitor
Transient Behavior of Capacitor
Capacitors in Series and Parallel
Testing of Capacitor Bank
How to Test Capacitors?
Join us as Electrical Content Writer
Questions on Battery
Questions on Electrical Earthing
SI System of Units
Analysis of Exponential Fourier Series
What is Inductor and Inductance | Theory of Inductor
Applications of Shift Registers
Trigonometric Fourier Series
Fourier Series and Fourier Transform
Questions on Alternating Current
Questions on Insulator
Questions on Electrolysis
Questions on Electrical Fuse
Questions on Current and Voltage Source
Questions on Magnetic Materials
Electric Power Single and Three Phase Power Active Reactive Apparent
Vector Algebra | Vector Diagram
Relationship of Line and Phase Voltages and Currents in a Star Connected System
Vector Diagram | Three Phase Vector Diagram
Source of Electrical Energy
Earn with us
What is Electric Field?
This attraction or repulsion force must be within the Electric field. This electric field is denoted by Now, consider this force offered by this charge is and this electric field is . Again and both are proportional to charge q. Suppose, there are two positive charges, named Q1 and Q2. They are at R distance. Now, suppose Q2 charge creates an Electric Field where Q1(Q1 = q) tries to come in. This Q1 charge is called test charge. Now, as per Coulomb’s law both of them exert a repulsive force on each other when Q1 tries to come in the Electric Field of Q2. Their force of repulsion is, From here we can say that , Now, Electric force per unit +ve test charge which is called Electric Field (). So it can be written as (NB: Same Phenomenon occurs whether they are unlike charges)
What is the Direction of Electric Field?Electrostatic force and electrostatic field both are vector quantity. As electric field is the force per unit test charge, so the direction of electrostatic field must follow the direction of electrostatic force. Again the direction of the electric field intensity is given by the direction of motion of the test charge. Electric Field Intensity is always perpendicular to the surface. As per figure, two elimentary surface areas () are considered, named A and B. So number of lines of force through A is equal to the number of lines of force through B. Now we can calculate,
What Happens for More Charges Around a Test Charge?For a large number of charges Q1, Q2, Q3, Q4……etc is situated at various points in vacuum. A test charge is in their vicinity. So the test charge at any point will experience the force (by superposition Principle) Now Electric Field at any point can be calculated as,
Properties of Electric Field LinesElectric field Lines are two types.
- Non uniform
- Electric field lines of force have a tendency to get separated from each other in the direction perpendicular to their lengths. They repel if they are of like charges.
- Electric lines of force start from the positively charged surface of a body and end negatively charged surface of a body.
- These lines of force are like elastic string, they comes to contract in length i.e. attract each other with respect to the opposite charges.
- Closeness of lines of forces symbolizes more strength of electric field and vice versa.
- Parallel lines indicate uniform field.
- Two lines of forces never intersect each other.
- Lines of force never pass through a conductor, i.e. field inside a conductor is always zero.
- The tangential direction at any point on the lines of forces indicates the direction of the force acting on the positive charge at that point.