Test: Electric Field Density

# Test: Electric Field Density

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## 9 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Electric Field Density

Test: Electric Field Density for Electrical Engineering (EE) 2023 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Electric Field Density questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Electric Field Density MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electric Field Density below.
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Test: Electric Field Density - Question 1

### The lines of force are said to be

Detailed Solution for Test: Electric Field Density - Question 1

Explanation: The lines drawn to trace the direction in which a positive test charge will experience force due to the main charge are called lines of force. They are not real but drawn for our interpretation.

Test: Electric Field Density - Question 2

### Which of the following correctly states Gauss law?

Detailed Solution for Test: Electric Field Density - Question 2

Explanation: The electric flux passing through any closed surface is equal to the total charge enclosed by that surface. In other words, electric flux per unit volume leaving a point (vanishing small volume), is equal to the volume charge density.

Test: Electric Field Density - Question 3

### Find the flux density of a sheet of charge density 25 units in air.

Detailed Solution for Test: Electric Field Density - Question 3

Explanation: Electric field intensity of infinite sheet of charge E = σ/2ε.
Thus D = εE = σ/2 = 25/2 = 12.5.

Test: Electric Field Density - Question 4

The electric flux density is the

Detailed Solution for Test: Electric Field Density - Question 4

Explanation: D= εE, where ε=εoεr is the permittivity of electric field and E is the electric field intensity. Thus electric flux density is the product of permittivity and electric field intensity.

Test: Electric Field Density - Question 5

A uniform surface charge of σ = 2 μC/m2, is situated at z = 2 plane. What is the value of flux density at P(1,1,1)m?

Detailed Solution for Test: Electric Field Density - Question 5

Explanation: The flux density of any field is independent of the position (point). D = σ/2 = 2 X 10-6(-az)/2 = -10-6.

Test: Electric Field Density - Question 6

Find the flux density of line charge of radius (cylinder is the Gaussian surface) 2m and charge density is 3.14 units?

Detailed Solution for Test: Electric Field Density - Question 6

Explanation: The electric field of a line charge is given by, E = λ/(2περ), where ρ is the radius of cylinder, which is the Gaussian surface and λ is the charge density. The density D = εE = λ/(2πρ) = 3.14/(2π X 2) = 1/4 = 0.25.

Test: Electric Field Density - Question 7

Find the electric field intensity of transformer oil (εr = 2 approx) with density 1/4π (in 109units)

Detailed Solution for Test: Electric Field Density - Question 7

Explanation: D = εE. E = (1/4π)/(2Xεo) = 4.5 X 109 units.

Test: Electric Field Density - Question 8

Electric flux density in electric field is referred to as

Detailed Solution for Test: Electric Field Density - Question 8

Explanation: Electric flux density is given by the ratio between number of flux lines crossing a surface normal to the lines and the surface area. The direction of D at a point is the direction of the flux lines at that point.

Test: Electric Field Density - Question 9

If the radius of a sphere is 1/(4π)m and the electric flux density is 16π units, the total flux is given by,

Detailed Solution for Test: Electric Field Density - Question 9

Explanation: Total flux leaving the entire surface is, ψ = 4πr2D from Gauss law. Ψ = 4π(1/16π2) X 16π = 4.

## Electromagnetic Fields Theory (EMFT)

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## Electromagnetic Fields Theory (EMFT)

11 videos|46 docs|62 tests