Take Class 12 Tuition from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Search in

Write the expression for speed of electromagnetic waves in a medium of electrical permittivity ϵ and magnetic permeability μ.

Asked by Last Modified  

Follow 7

Please enter your answer

Physics Tutor

Expressions for the electric and magnetic fields in free space contain the electric permittivity ε0 and magnetic permeability μ0 of free space. These two quantities are not independent but are related to "c", the speed of light and other electromagnetic waves. The magnetic constant μ0 =...
read more

Expressions for the electric and magnetic fields in free space contain the electric permittivity ε0 and magnetic permeability μ0 of free space. These two quantities are not independent but are related to "c", the speed of light and other electromagnetic waves. The magnetic constant μ0 = 4π x 10-7 T m/A is called the permeability of space. The permeabilities of most materials are very close to μ0 since most materials will be classified as either paramagnetic or diamagnetic. But in ferromagnetic materials the permeability may be very large and it is convenient to characterize the materials by a relative permeability. 
This contains the force unit N for Newton and the unit A is the Ampere, the unit of electric current.

With the magnetic permeability established, the electric permittivity takes the value given by the relationship

c = 1/sqrt(ε0μ0)

where the speed of light is given by

c=2.99792458 x 10^8 m/s (exact)

This gives a value of free space permittivity

ε0 = 8.854187817 x 10^-12 F/m

which in practice is often used in the form

k = 1/4piε0 = 8.987552 X10^9 Nm^2/C^2 = Coulomb's constant

These expressions contain the units F for Farad, the unit of capacitance, and C for Coulomb, the unit of electric charge.

The electric permittivity is connected to the energy stored in an electric field. It is involved in the expression for capacitance because it affects the amount of charge which must be placed on a capacitor to achieve a certain net electric field. In the presence of a polarizable medium, it takes more charge to achieve a given net electric field and the effect of the medium is often stated in terms of a relative permittivity.

read less

Fond to play cricket

C= 1/√μ∈



Mathematics & Statistics Teacher

C= 1/√μ∈

Physics Teacher

c=1/square root of (electrical permittivity ) c=velocity of light in vaccum. v=1/square root of (electrical permittivity in a medium in that medium) v=velocity of light in that medium
read more

c=1/square root of (electrical permittivity )

c=velocity of light in vaccum.

v=1/square root of (electrical permittivity in a medium  in that medium)

v=velocity of light in that medium

read less

Fond to play cricket

Expression for speed can be derivied by following steps

Primary Teacher

C= 1/√μ∈


C= 1/√μ∈

View 6 more Answers

Related Questions

why the frequency of light does not change when it entered into the denser medium ?

This is because frequency is the inherent property of any matter. It is fixed and specific for a particular substance. It doesn't vary as its the 'identity' of a particle or a wave.
Shubham Tomar
0 0

Can you add three unit vectors to get a unit vector? Does the answer change if two unit vectors are along coordinate axis? Please give example.

If two unit vector in same direction (along),third unit vector in opposite direction situated after applying law's of vector addition along coordinate we will gate unit vector..which is result of three...
Deepika T.
0 0

How to improve communication skills?

Read newspaper daily. Watch youtube videos on news clippings. Download a short 1-minute video. Write the text and try to speak in that manner. Record your voice and listen. Compare it with the newsreader...

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Electrostatics made of two words Electrostatics= Electro + statics Electro means Electron (charge) statics means in rest position so we can say that Electrostatics is the branch of Physics in which...

Electrostatic and Magnetism_lesson1
State true or False: 1. The intensity of the electric field decreases as you go away from the centre of a uniformly charged solid sphere. 2. The angle between the positive normal of a current loop and...

Abdul Aziz

0 0

Written Discussion on Physics Chapter : Atoms and Nuclei
This Demo lesson includes the introduction to one of the highest weightage chapters of Physics inboards ATOMS Starting from Rutherford's nuclear model of an atom to the alpha particle trajectory, physics...


0 0

Polarity of Rod in Motional EMF Electromagnetic Induction
The polarity of the RodThere is a critical topic in EMI called Motional emf. There is a specific use case where the Rod moves over between the Rails. We know that when this Rod moves in the Perpendicular...


0 0

Recommended Articles

Raghunandan is a passionate teacher with a decade of teaching experience. Being a skilled trainer with extensive knowledge, he provides high-quality BTech, Class 10 and Class 12 tuition classes. His methods of teaching with real-time examples makes difficult topics simple to understand. He explains every concept in-detail...

Read full article >

Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student...

Read full article >

Mohammad Wazid is a certified professional tutor for class 11 students. He has 6 years of teaching experience which he couples with an energetic attitude and a vision of making any subject easy for the students. Over the years he has developed skills with a capability of understanding the requirements of the students. This...

Read full article >

Radhe Shyam is a highly skilled accounts and finance trainer with 8 years of experience in teaching. Accounting is challenging for many students and that’s where Radhe Shyam’s expertise comes into play. He helps his students not only in understanding the subject but also advises them on how to overcome the fear of accounts...

Read full article >

Looking for Class 12 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you

Looking for Class 12 Tuition Classes?

The best tutors for Class 12 Tuition Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Take Class 12 Tuition with the Best Tutors

The best Tutors for Class 12 Tuition Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more