admin - Physics Q and A

Mastering Units, Measurement & Precision

by adminJuly 22, 2025July 28, 20250

(IIT-JEE/NEET/Board Exam Focused) “Measurement is comparing physical quantities with standard units.” Why Units Rule Physics Units are universal references (e.g., meter, second). Every measurement has …

Sound

by adminMay 26, 2025May 27, 20250

📘 Chapter Overview This chapter explores sound’s nature, production, propagation, and characteristics. It discusses how sound waves travel, their speed in various media, concepts of …

Work and Energy

by adminMay 26, 2025May 26, 20250

📘 Chapter Overview This chapter explains the concepts of work, energy, and power in science. It covers how work is done, how energy changes form, …

Gravitation

by adminMay 24, 2025May 24, 20250

📘 Chapter Overview The chapter “Gravitation” introduces the universal force of attraction between objects – gravity. It explains Newton’s law of gravitation, free fall, weight, …

Force and Laws of Motion

by adminMay 23, 2025May 23, 20250

🔷 Chapter Overview This chapter introduces Newton’s Laws of Motion, explains the concept of force, inertia, momentum, and gives a mathematical foundation to understand how …

MOTION

by adminMay 9, 2025May 9, 20250

Chapter 7 – Motion (Class 9 Science)This chapter introduces the fundamental concepts of motion in physics. It helps students understand how objects move, how their …

An infinitely long wire, located on the z-axis, carries a current $I$ along the $+z$ -direction and produces the magnetic field $\vec{B}$ . The magnitude of the line integral $\int \vec{B} \cdot d\vec{l}$ along a straight line from the point $(-\sqrt{3}a, a, 0)$ to $(a, a, 0)$ is given by:
$\text{[} \mu_0 \text{ is the magnetic permeability of free space.] }$

by adminApril 26, 2025April 26, 20250

Problem: An infinitely long wire, located on the z-axis, carries a current along the -direction and produces the magnetic field . The magnitude of the …

A dimensionless quantity is constructed in terms of electronic charge $e$ , permittivity of free space $\varepsilon_0$ , Planck’s constant $h$ , and speed of light $c$ . If the dimensionless quantity is written as $e^\alpha \varepsilon_0^\beta h^\gamma c^\delta$ and $n$ is a non-zero integer, then $(\alpha, \beta, \gamma, \delta)$ is given by

by adminApril 23, 2025April 23, 20250

Problem: A dimensionless quantity is constructed in terms of electronic charge , permittivity of free space , Planck’s constant , and speed of light . …

Newton’s Laws of Motion: Definitions, Examples, and Real-World Applications

by adminApril 22, 2025April 22, 20250

Imagine riding in a car that suddenly stops — the body continues to move forward until the seatbelt pulls it back. This everyday experience perfectly …

How To Find Instantaneous Velocity

by adminApril 17, 2025April 17, 20250

To find the instantaneous velocity of an object, we have to use the concept of limits and derivatives(calculus). Instantaneous velocity is defined as the velocity …