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Dimensions Of Electric Flux

Last updated date: 29th May 2024
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Introduction: Electric flux

Electrical flux is the measure of the electric field through a given surface although an electrical field cannot flow in itself. It is a way to describe the strength of the electric field at any distance from the charge that causes the field.


At any point in space, the electric field E will exert a force on an electrical charge. The electric field shall be proportional to the voltage gradient.

Dimensional Formula of Electric Flux

The dimensional formula of electric flux is expressed by,

[M1 L3 T-3 I-1]


  • M = Mass

  • I = Current

  • L = Length

  • T = Time


Electric Flux (ΦE) = E × S × cos θ -------------------------- (1)


E = Magnitude of the electric field

S = Surface Area

The dimensional formula of area (S) = [M0 L2 T0] --------------------------(2)

Since, Electric Field = [Force × Charge-1] . . . (3)

The Dimensional Formula of,

  • Force = m × a = [M1 L1 T-2] ------------------------(4)

  • Charge = current × time = [I1 T1] --------------------(5)

substitute equation (4) and (5) into equation (3) the result obtained is,

Electric Field = [M1 L1 T-2] × [I1 T1]-1

Therefore, The dimensional formula of Electric Field = [M1 L1 T-3 I-1] -------(6)

substitute equation (2) and (6) in equation (1) we observe,

⇒ Electric Flux = E × S × cos θ

Or, ΦE = [M1 L1 T-3 I-1] × [M0 L2 T0] = [M1 L3 T-3 I-1]

Thus, the electric flux is dimensionally shown as [M1 L3 T-3 I-1].


Eligibility Criteria for IIT JEE

JEE Main has a set of eligibility criteria and it is expected from candidates that they are well informed about it. Candidates must look at the eligibility criteria before appearing for the exam; the details regarding the eligibility criteria are available on the official website of NTA JEE and in its brochure. Or you can read about it below. 

  • Age Limit: JEE mains has set no age bar for candidates who are interested to appear for the exams.

  • Educational Qualification: Candidates must have completed their class 12 from a board recognized by the central government or state government. If candidates have qualified for an exam equivalent to class then also the candidate is eligible to appear for the exam.

  • Number of Attempts: candidates have 3 attempts to clear the exam within the three consecutive years from the year of passing class 12.

  • Compulsory Subjects in Qualifying Exams: Physics, Mathematics, and Chemistry/Biology/biotechnology/technical vocational subjects are compulsory subjects for B. Tech. 

Physics, chemistry, and mathematics are compulsory subjects for B.Arch.

Mathematics is compulsory for B.Plan.


Preparation Tips

Cracking an exam of this magnitude is a hardworking job and it requires dedication, determination, and planning. Applicants are advised to have a practical plan of preparation to crack JEE Mains and JEE Advanced. A practical timetable is a necessity to cover the vast syllabus of JEE Main. Students must make their timetable that suits their methods of studying and should strictly follow. The students are advised to practice as many sample papers from reference books as possible and sample papers provided online.


Students must carefully select the books they are gonna study from. Check that the books they are using have an updated syllabus and have sufficient study material. Revision is an important part of the preparation in order to qualify the IIT JEE Mains. A good revision session before exams boost up students’ confidence and help them to remain calm. A calm mind before the exam helps students to control their nerves and be confident.

FAQs on Dimensions Of Electric Flux

1. What is the SI unit and dimension of Electric Flux?

The dimensional formula of electric flux is represented by, [M1 L3 T-3 I-1]

2. What is the SI unit of Electric Flux?

Electrical flux has SI units of voltmeters (V m), or, evenly, Newton meters squared per coulomb (N m2 C−1). Thus, the SI base units of electric flux are kg·m3·s−3·A−1.

3. Is Electric Flux a vector?

Flux is a vector quantity for transport phenomena, defining the magnitude and direction of flow of a material or property. Flux is a scalar quantity in vector calculus, defined as the integral surface of the perpendicular part of a vector field over a line.

4. Is IIT and JEE the same?

Joint Entrance Exams (JEE) is a national entrance exam that is conducted for candidates that are interested in admission to engineering courses from various colleges across the country.

Indian Institute of Technology (IIT) is the most prominent college in the country to study engineering. Candidates that qualify for both JEE Mains and JEE advanced exams are eligible to get admission at top colleges and IITs. 

5. What is the difference between JEE Main and Advanced?

Many students get confused between JEE Main and JEE advanced. JEE Main is an entrance exam that is conducted by NTA for admissions to undergraduate engineering programs at institutes such as NITs, IIITs, and other institutes funded either by the central government or the state government. 

JEE advanced is an exam that students have to appear for in order to get admission into various undergraduate programs across all Indian Institutes of Technology or commonly known as IITs. 

Some of the major differences between IIT JEE Main and IIT JEE advanced are listed below:

  • JEE Mains allows 3 attempts to appear for exams whereas JEE Advanced permits only 2 attempts to students.

  • JEE Mains holds examinations 4 times a year whereas JEE Advanced is conducted only once every year.

  • The process of JEE Mains stretches to multiple days in two shifts but JEE Advanced is conducted on a single day. 

  • For admission to B.Tech courses JEE Mains requires students to appear for only one paper whereas JEE advanced requires students to appear for two papers.

  • JEE Mains exams are more based on memory and test the understanding, speed, and accuracy of applicants whereas JEE advanced focuses and tests applicants’ in-depth understanding of concepts.