QUESTIONS FOR SHORT ANSWER 1. The metre is defined as the distance travelled by light in 1/299,792,458 second. Why didn’t people choose some easier number such as 1/300,000,000 second ? Why not 1 second ? Answer: The number 299,792,458 was chosen because it is the exact, measured speed of light in vacuum, not an approximation. …
H C Verma Concept of Physics Solution | Chapter 1: Introduction To Physics Read More »
Exercise Questions 1. A man has to go 50m due north, 40m due east and 20m due south to reach a field. (a)What distance he has to walk to reach the field? (b)What is his displacement from his house to the field? Solution: Step 1: Identify the Path Segments The motion consists of three distinct …
HC Verma Physics Solutions Part I: Chapter 3 Kinematics Read More »
Exercise Questions 1. A man has to go 50m due north, 40m due east and 20m due south to reach a field. (a)What distance he has to walk to reach the field? (b)What is his displacement from his house to the field? Solution: Step 1: Identify the Path Segments The motion consists of three distinct …
Chapter 3. Current Electricity
1. The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4Ω, what is the maximum current that can be drawn from the battery? (A) 30 A (B) 40 A (C) 20 A (D) 50 A Answer: (A) 30 A Explanation: The maximum current is …
The torque-speed characteristic curve is one of the most important performance indicators of a three-phase induction motor. It shows how the motor’s developed torque varies with rotor speed, from standstill to synchronous speed, and helps engineers understand starting performance, running behavior, and overload capacity. Torque Equation: The torque \( T \) developed by a three-phase …
Torque-Speed Curve of Three-Phase Induction Motor Read More »
Q. A circle with the equation \( (x – h)^2 + (y – k)^2 = r^2 \) is shifted 3 units to the right and 2 units down. What is the new equation of the circle? Solution: The original center of the circle is \( (h, k) \). After shifting 3 units to the right …
The Biot–Savart Law is a fundamental relation in electromagnetism that explains how a current-carrying conductor produces a magnetic field. It is analogous to Coulomb’s Law, but instead of charges, it deals with moving charges (current). When current flows through a wire, a magnetic field is generated around it. The Biot–Savart Law helps us calculate the …
1. The dimensions of \( \frac{1}{2} \varepsilon_0 E^2 \) is (1) \( MLT^{-2} \) (2) \( ML^{-1}T^{-2} \) (3) \( MLT^{-1} \) (4) \( ML^{-1}T^{-1} \) Answer: (2) Explanation: The expression \( u_e = \frac{1}{2} \varepsilon_0 E^2 \) represents electric energy density, which means the electrical energy stored per unit volume in an electric field. …
JEE (Main) 2026 | Phase-2 | Exam Date: 02-04-2026 | Morning Shift Read More »
Q. What is the maximum value of \( \sin x \cdot \cos x \)? (a) 1 (b) 0.5 (c) 2 (d) 0.25 Answer: (b) 0.5 Explanation: Using the trigonometric identity \( \sin(2x) = 2 \sin x \cos x \), we can rewrite the expression as \( \frac{1}{2} \sin(2x) \). The maximum value of any sine function …