Class 12

Adden On 2019-Feb-03
2 Books
(24 Reviews)
As physics is one of the most intuitive subjects of all with equal weight in terms of masks in both board exams and IIT JEE entrance exams it makes sense to not to take chance in this high scoring subject. Along with maths where you have learned derivatives and integrations, physics will help you get high percentile in your IIT JEE tests. Besides the fact that it's easy to score marks in physics when you have a good understanding in maths, it's actually the basis of most of the engineering streams you will have the option to choose when you go to a college. Below you can find the syllabus you will be covering in this course
As the name suggests Electrostatics is a study of effects of electric charge at rest and overall below we have a list of subtopics for this section

Electric  Charges;  Conservation  of  charge,  Coulomb's  law-force  between  two  point  charges, forces between multiple charges; superposition principle and continuous charge distribution. Electric field, electric field due to a point charge, electric field lines, electric dipole, electric field due to a dipole, torque on a dipole in uniform electric field. Electric  flux,  statement  of  Gauss's  theorem  and  its  applications  to  find  field  due  to  infinitely long straight wire, uniformly charged infinite plane sheet and uniformly charged thin spherical shell (field inside and outside).

Electric  potential,  potential  difference,  electric  potential  due  to  a  point  charge,  a  dipole  and system of charges; equipotential surfaces, electrical potential energy of a system of two point charges and of electric dipole in an electrostatic field. Conductors  and  insulators,  free  charges  and  bound  charges  inside  a  conductor.  Dielectrics  and electric  polarisation,  capacitors  and  capacitance,  combination  of  capacitors  in  series  and  in parallel, capacitance of a parallel plate capacitor with and without dielectric medium between the plates, energy stored  in a capacitor.

Current Electricity
Now after learning the Electrostatic, we move to the moving charge particles and what's the best example you can give other than the current flowing in the wires in your home and gadgets.

Electric  current,  flow  of  electric  charges  in  a  metallic  conductor,  drift  velocity,  mobility  and their relation with electric  current; Ohm's law,  electrical resistance, V-I  characteristics (linear and  non-linear),  electrical  energy  and  power,  electrical  resistivity  and  conductivity,  Carbon resistors,  colour  code  for  carbon  resistors;  series  and  parallel  combinations  of  resistors; temperature dependence of resistance.

Internal  resistance  of  a  cell,  potential  difference  and  emf  of  a  cell,  combination  of  cells  in series  and  in  parallel,  Kirchhoff's  laws  and  simple  applications,  Wheatstone  bridge,  metre bridge.

Potentiometer   -  principle  and  its  applications   to   measure  potential  difference  and  for comparing EMF of two cells; measurement of internal resistance of a cell.

Effects of Current & Magnetism
Now when we understand how the current flow in a conductor it's time to learn what are the effects of such flow of electrons on the conductor and it's surrounding

Concept of magnetic field, Oersted's experiment.

Biot - Savart law and its application to current carrying circular loop.

Ampere's law and its applications to infinitely long straight wire. Straight and toroidal solenoids (only qualitative treatment), force on a moving charge in uniform magnetic and electric fields, Cyclotron.

Force on a current-carrying conductor in a uniform magnetic field, force between two parallel current-carrying  conductors-definition  of  ampere,  torque  experienced  by  a  current  loop  in uniform  magnetic  field;  moving  coil  galvanometer-its  current  sensitivity  and  conversion  to ammeter and voltmeter.

Current loop as a magnetic dipole and its magnetic dipole moment, magnetic dipole moment of a  revolving  electron,  magnetic  field  intensity  due  to  a  magnetic  dipole  (bar  magnet)  along  its axis  and  perpendicular  to  its  axis,  torque  on  a  magnetic  dipole  (bar  magnet)  in  a  uniform magnetic  field;  bar  magnet  as  an  equivalent  solenoid,  magnetic  field  lines;  earth's  magnetic field and magnetic elements.

Para-, dia- and ferro - magnetic substances, with examples.

Electromagnets and factors affecting their strengths, permanent magnets.