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When placed in an electric field, polarization is the alignment of dipole moments in a dielectric material. In a dielectric, molecules are randomly oriented. When an electric field is applied, it creates induced dipoles by slight shift in molecules from positive to negative. This weakend the net field, reduces the internal electric field and allow more charge storage. The polarization is quantified as:

Here, V is the volume, Pm is the total dipole moment. The polarization is a key concept in understanding the dielectric behavior in capacitors and it leads to increased capacitance.

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. 

Students can access all the important formulas along with the concepts used to solve these problems on Shiksha's NCERT Solutions page for Probability. Students can check all the important formulas in the NCERT Solutions for Probability. The link of the page is provided below;

NCERT Solutions for Class 12 Probability