Exam

The TNPSC Group 4 2025 application started on April 25, 2025, with the release of notification. The last date to apply online was May 24, 2025. The application correction window was available from May 29 to May 31, 2025. The TNPSC Group 4 exam 2025 was conducted on July 12, 2025.

In an electric field, energy density is the amount of energy stored per unit volume . For a linera or vacuum dieletric, it is given by:

E is the electric field magnitude and ?0  is the permittivity of free space. 

No, You have compulsory maths ( pcm or pcmb ) in 11th and 12th for appearing in JEE main exam .

It's eligibility criteria for appearing in JEE Mains exam.

Where every point has the same electric potential, it is an equipotential surface:

The main characterstics include:

• Two equipotential surfaces never intersect.
• The electric field is always perpendicular to an equipotential surface.
• Equipotential surfaces are parallel planes in a uniform electric field.
• If the surfaces are closer, the field in that region will be stronger.

The negative gradient of the electric potential is called an electric field. The electric field points in the direction of the steepest decrease of potential. The electric field is defined in a simpler terms as equal to the change in potential per unit displacement.  The electric field is strong, if the potential decreases sharply over a small distance. The electric field can be calculated using this relationship if the potential distribution is known, and vice versa. It is important for the understanding of the energy transfer in electrostatics and charge dynamics.

At any point, the electrostatic potential is the amount of work done in bringing a unit positive test charge from infinity to that point in an electric field. It is done without acceleration. It is denoted by V and it is a scalar quantity.
? =? /Q
where? is the work done and q is the test charge. 
The electrostatic potential helps in quantifying the energy configuration of charges. The unit is volt (V), where 1 V = 1 J/C. 

For BTech admission at GNDU RC Jalandhar, it is mandatory to appear for the JEE Main entrance exam. In addition to this, candidates must have passed Class 12 with at least 50% aggregate.  Further, candidates must participate in the counselling round for the seat allotment procedure. After the selection process is completed, the University will release the merit list on its official website. All the candidates, whose name is on the merit-list, are required to appear for the counselling/ interview process for seat allocation and document verification process.