admin - Physics Q and A

RMS Value Explained: Why It’s More Important Than Average Value in AC Circuits

by adminDecember 5, 2025December 10, 20250

Introduction: The AC Measurement Mystery Have you ever wondered why we say 220V AC in our homes instead of “311V AC” when the peak voltage …

Room-Temperature Superconductors in 2025: Real Breakthrough or Hype?

by adminDecember 4, 2025December 4, 20250

Room-temperature superconductors in 2025 research has reached a pivotal moment. For over a century, physicists have dreamed of a material that can conduct electricity with …

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 . …