Clas X is the first phase for every student to face the burden of a national level competition. Here Oureducation.in is helping you to revise and keep notes of some important formulae, topics and chapters. The post describes some formulae of Class X physics from chapters Electricity and Magnetic Effects of Current, these being few of the most important chapters for boards.
Coulomb’s Law =(Q1*Q2)/(r*r)k ; where k= constant, Q1, Q2 are the charges on bodies 1 and 2.
Conduction current ( I ) = dQ/dt ; where Q= charge and t = time, dQ=charge on the body for very short interval of time dt
Constant current ( I ) = Q/t ; where Q= charge and t= time
Current density ( J ) = I/ A ; where I= current and A= area in square meter
Electric Power ( P ) = V/I ; where V= voltage and I= current
Conductance ( G ) = 1/ R ; where R = resistance of the body
Ohm’s Law = V= IR ; where V= voltage, I = current and R= resistance of the body
Series connection of resistors, Req =( R1+ R2 + R3 +….+ Rn) ; where R1, R2, R3 — Rn are the respective resistances of “n” number of bodies.
Parallel connection of resistors, Req = (1/R1 + 1/R2 + 1/R3 +…+ 1/Rn) ; where R1, R2, R3 — Rn are the respective resistances of “n” number of bodies.
Electric work done = U I t = UQ ; where U= potential energy , Q= charge, I = curent and t=time
Thermal emission = j = AT*T exp(-Wa/kT)
Force in electric field ( F) = E .Q ; where E= Electric Field and Q= Charge on body
Voltage in plate capacitor = V= Ed ; where E= Electric Field and d= distance vector
Energy of particle accelerated in an electric field ( E ) = QU
Effective current in AC circuit = I = Ieff/ ( 2 ) ^1/2
Effective voltage in AC circuit = V = Veff / (2 )^ 1/2
Ohm’s law in a.c. circuit , V= IZ ; where I = current, V= voltage and Z= impedance
Thomsons equation, w = (1/LC )^ (1/2) ; where L=inductance, W=Work Done and C = Capacitance.
CHAPTER- Magnetic Effects of Current
B (inversely proportional) (I/r) ; where B= Strength of Magnetic Field, I=current passed through conductor and r=distance from conductor
B=(µI/2πr) where B= Strength of Magnetic Field, r= distance from conductor, I=current passed through conductor and µ= permeability of medium