Formula Library

+917011494251 contact@prexms.com

Showing 15 of 39 formulas Page 2 of 2

Parallel Resistors

$$\frac{1}{R_{eq}} = \sum \frac{1}{R_i}$$

Calculates total resistance when current has multiple paths.

📖 Physics 📚 Current Electricity

Kirchhoff's Voltage Law (KVL)

The algebraic sum of all electrical potential differences around any closed network (loop) is zero.

📖 Physics 📚 Current Electricity

Electric Potential of Point Charge

$$V = \frac{1}{4\pi\epsilon_0} \frac{q}{r}$$

The work done per unit charge in bringing a positive test charge from infinity to a point.

📖 Physics 📚 Electrostatics

Lorentz Force Law (Total)

$$\vec{F} = q(\vec{E} + \vec{v} \times \vec{B})$$

The total force acting on a point charge moving through both electric and magnetic fields.

📖 Physics 📚 Moving Charges

Phase Angle in LCR Circuit

$$\tan \phi = \frac{X_L - X_C}{R}$$

The angle by which the current lags or leads the voltage in an alternating current circuit.

📖 Physics 📚 AC Circuits

Coulomb's Law in Media

$$F = \frac{1}{4\pi\epsilon_0 K} \frac{q_1 q_2}{r^2}$$

The force between two point charges placed in a dielectric medium.

📖 Physics 📚 Electrostatics

Resonance Frequency (LCR)

$$f_r = \frac{1}{2\pi\sqrt{LC}}$$

The frequency at which the inductive and capacitive reactances cancel each other, allowing maximum current.

📖 Physics 📚 AC Circuits

Magnetic Potential Energy

$$U = -\vec{m} \cdot \vec{B} = -mB \cos \theta$$

The energy of a magnetic dipole (like a compass needle) in an external magnetic field.

📖 Physics 📚 Magnetism

Electric Flux (Gauss's Law)

$$\Phi_E = \oint \vec{E} \cdot d\vec{A} = \frac{q_{enc}}{\epsilon_0}$$

The net electric flux through any closed surface is equal to the net charge enclosed by the surface divided by $\epsilon_0$.

📖 Physics 📚 Electrostatics

Force between Parallel Currents

$$F/l = \frac{\mu_0 I_1 I_2}{2\pi d}$$

Force per unit length between two infinitely long, parallel current-carrying wires.

📖 Physics 📚 Moving Charges

Inductance of a Long Solenoid

$$L = \frac{\mu_0 N^2 A}{l}$$

Calculates the self-inductance of an air-core solenoid.

📖 Physics 📚 Induction

Average Power (DC)

$$P = VI = I^2R = \frac{V^2}{R}$$

The rate at which electrical energy is converted into other forms (like heat).

📖 Physics 📚 Current Electricity

Coulomb's Law (Vector Form)

$$\vec{F} = \frac{1}{4\pi\epsilon_0} \frac{q_1 q_2}{r^2} \hat{r}$$

Force between two point charges in vacuum.

📖 Physics 📚 Electric Charges and Fields

Gauss's Law

$$\oint \vec{E} \cdot d\vec{A} = \frac{q_{in}}{\epsilon_0}$$

Total electric flux through a closed surface is $1/\epsilon_0$ times the net charge enclosed.

📖 Physics 📚 Electric Charges and Fields

Energy Stored in Capacitor

$$U = \frac{1}{2}CV^2 = \frac{1}{2}QV$$

Potential energy stored in the electric field of a capacitor.

📖 Physics 📚 Electrostatic Potential and Capacitance

1 2

Get In Touch

We're Here to Help You

Have questions about programs? Need guidance on which course fits you? Our team responds fast.

Talk to an Expert

Our counsellors help you pick the right program for your exam goal and timeline — completely free of charge.

Our Office

GRAWIO BANJARI INDUSTRIES PRIVATE LIMITED HD 463 WEWORK DLF FORUM, CYBERCITY PHASE III, DLF QE, Dlf Qe

Email Us

contact@prexms.com

Call / WhatsApp

🕐 Office Hours

Monday – Saturday 10 AM – 6 PM Open

Sunday Closed

📍 Walk in for free counselling — no appointment needed

Send a Message

Your Name

Email Address

Phone Number

Your Message