JEE MAINS

Starting early is the key to success, here is a list of tricks to crack JEE Main:
1. Dedicated study plan: Devise a strategy for JEE Main and stick to it thoroughly so that each topic gets sufficient practice and revision.
2. Maximize speed: As a JEE Main aspirant it is important to develop a good speed so try to solve at least 70-80 numerical every day.
3. Time to clear doubts: If you stumble upon a concept and can’t figure the way out, it is best to take help from your mentors or co-JEE Main aspirants. This will not only help you with the concept but also inform you of any flaws in your study pattern.
4. Aim for JEE Advanced: It is best to aim for JEE Advanced and not just limit your preparations to JEE Main. As the syllabus for both the exams is almost same, studying to clear JEE Advanced will help you cover most of the JEE Main syllabus in depth.
5. Balance between coaching and self-study: If coaching takes up 3-4 hours each day then put aside at least 2-3 hours for self study too. This balance is necessary to revise/ practice concepts and prepare for the next class.
6. Practice makes you perfect: Once you have understood the concept, go for solving question banks and test series. This is the best way to know the trend of questions to be expected at JEE Main. There is no way you can crack JEE by just memorizing concepts if you do not know how to apply them.
7. Paper solving strategy: You need to identify what strategy works best for you to solve the JEE Main. For instance, during mocks, if solving toughest questions first, then less difficult and keeping the easiest for the last works for you then go ahead with it, otherwise find what method helps you get accurate results in shortest time.
8. Passionate about becoming an IITian: If IIT is your goal then keep your enthusiasm up by considering your studies as the most satisfying and content hours of the day.
9. Quality time for studies: Irrespective of number of hours you study, give it your 100 percent. A half-baked preparation will never work out, so study smart instead of prolonging the hours you sit in front of the books.
10. Refresh button: Relax and take breaks during your hectic study timetable. Use this time to rejuvenate yourself, watch a movie, listen to some songs, or play a sport. This will help you to stay focused and feel fresh.
Apart from these tips, it is important to keep practicing test papers. It will teach you how to approach JEE mains question paper.
Best of luck for your preparations.

Substitution Nucleophilic unimolecular (S 1)
This reaction is carried out in polar protic solvents such as water,
alcohol, acetic acid etc. This reaction follows first order kinetics.
Hence, this is named as substitution nucleophilic unimolecular.
This reaction takes place in two steps as described below:
1. In step 1, the bond between carbon and halogen breaks due
to presence of a nucleophile and formation of carbocation
takes place. It is the slowest and the reversible step as huge
amount of energy is required to break the bond. The bond is
broken by solvation of the compound in protic solvent, thus
this step is slowest of all. The rate of reaction depends only
on haloalkane not on nucleophile.
2. In step 2, the nucleophile attacks the carbocation formed
in step 1 and the new compound is formed.
Since, the rate defining step of the reaction is formation of
carbocation, hence greater the stability of formation of
intermediate carbocation, more is the ease of the compound
undergoing substitution nucleophilic unimolecular or S 1
reaction. In case of alkyl halides, 3 alkyl halides undergo S 1
reaction very fast because of the high stability of 3
carbocations. Hence allylic and benzylic halides show high
reactivity towards the S 1 reaction.

Substitution Nucleophilic bimolecular (S 2)
This reaction follows second order kinetics and the rate of
reaction depends upon both haloalkane as well as participating
nucleophile. Hence this reaction is known as substitution
nucleophilic bimolecular reaction. In this reaction, the
nucleophile attacks the positively charged carbon and the
halogen leaves the group. Both the formation of carbocation
and exiting of halogen take place simultaneously. In this
process, unlike S 1 mechanism the inversion of configuration is
observed. Since this reaction requires the approach of the
nucleophile to the carbon bearing the leaving group, the
presence of bulky substituents on or near the carbon atom has a
dramatic inhibiting effect. So opposite to S 1 reaction
mechanism, this is favoured by mostly by primary carbon, then
secondary carbon and then tertiary carbon.

The ability of some neutral atoms, molecules, and free radicals to capture additional electrons and thereby become negative ions. For each specific type of particle, this ability is measured by the quantity S, known in English simply as the electron affinity. 5 is equal to the energy difference between the neutral atom or molecule in the ground state and the ground state energy of the negative ion formed after the addition of the electron.
For most atoms, the ability to add an electron results from the atoms’ outer electron shells not being filled (see). Such atoms include H atoms and elements of Group I of the periodic table, which have one outers electron, and also atoms of groups III, IV, V, VI, and VII, which have incomplete shells. The capture of an additional electron by Fe, Co, and Ni atoms, which in the normal state have two outer electrons, is generally believed to lead to the filling of a free position in the inner 3d shell.The value of S has been accurately determined for only a few atoms; the data on the S of molecules and radicals are, for the most part, insufficiently reliable. The 5 of atoms can be measured directly, for example, by determining the wavelength of light λ0corresponding to the threshold of photo detachment of an electron from the negative ion:S=hcλ0, where his Planck’s constant and c is the speed of light. The values of S for C, O, S, I, and Cl atoms have been established by this method. The use of the surface ionization effect(the vaporization of halogen atoms from the surface of incandescent W) to measure 5 has not yet yielded accurate values of 5. The reason for this failure is that, because of the polycrystalline structure of W, the work function is not the same on different parts of the surface. When two atoms are vaporized from the same surface and become negative ions, the difference in the 5 of the two atoms can be determined with much higher accuracy. Typical values ofSfor atoms, in electron volts (eV), are as follows: H, 0.754; C, 1.25; 0, 1.46; S, 2.1; F, 3.37; Cl, 3.65; Br, 3.35; and 1,3.08. Thevalues of 5 for molecules and radicals vary over a wide range. In many cases they amount to fractions of an eV. Larger values, however, are also found: NO2, > 3 eV; OH~2 eV; and CN,

just like the resistor, the capacitor, sometimes referred to as a condenser,is a simple passive device that is used to “store electricity”. The capacitor is a component which has the ability or “capacity” to store energy in the form of an electrical charge producing a potential difference (Static Voltage) across its plates, much like a small rechargeable battery.There are many different kinds of capacitors available from very small capacitor beads used in resonance circuits to large power factor correction capacitors, but they all do the same thing, they store charge.In its basic form, a capacitor consists of two or more parallel conductive(metal) plates which are not connected or touching each other, but are electrically separated either by air or by some form of a good insulating material such as waxed paper, mica,ceramic, plastic or some form of a liquid gel as used in electrolytic capacitors. The insulating layer between a capacitors plates is commonly called the dielectric.

Electric Potential energy potential energy can be defined as the capacity for doingworkwhich arises from position or configuration. In the electrical case, a charge will exert a force on any other charge and potential energy arises from any collection of charges. For example, if a positive charge Q is fixed at some point in space, any other positive charge which is brought close to it will experience a repulsive force and will therefore have potential energy.The potential energy of a test charge q in the vicinity of this source charge will be:Showwhere k isCoulomb's constant.In electricity, it is usually more convenient to use the electric potential energy per unit charge, just calledelectric potentialor voltage.Application:Coulomb barrier for nuclear fusionEnergy in electron voltsIndexVoltage conceptsHyperPhysics*****Electricity and MagnetismR NaveGo BackZero PotentialThe nature of potential is that the zero point isarbitrary; it can be set like the origin of a coordinate system. That is not to say that it is insignificant; once the zero of potential is set, then every value of potential is measured withrespect to that zero. Another way of saying it is that it is the change in potential which has physical significance. The zero of electric potential (voltage) is set for convenience, but there is usually some physical or geometric logic to the choice of the zero point. For a singlepoint chargeor localized collection of charges, it is logical to set the zero point at infinity. But for an infinite line charge, that is not a logical choice, since the local values of potential would go to infinity. For practical electrical circuits, the earth orground potentialis usually taken to be zero and everything is referenced to the earth.Zero of potential at infinity