NCERT Class 12 Physics Solution
Chapter 3. Current Electricity
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NCERT Physics Class 12 Solution
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 …
Torque-Speed Curve of Three-Phase Induction Motor
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 …
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Co-ordinate Geometry
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 …
Biot–Savart Law
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 …
JEE (Main) 2026 | Phase-2 | Exam Date: 02-04-2026 | Morning Shift
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. …
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shorts
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 …
Cartesian to Polar Conversion
Conversion from Cartesian coordinates \((x, y)\) to Polar coordinates \((r, \theta)\) is a fundamental concept in mathematics. What are the two systems? Cartesian System → A point is represented as \((x, y)\) Polar System → A point is represented as \((r, \theta)\) Where: \(r\) = distance from origin \(\theta\) = angle with the positive \(x\)-axis …
GATE Exam
Electrical Engineering GATE EE Solved Question Paper 2026
Registers in Digital Electronics
In digital electronics, a register is a group of flip-flops used to store and move binary data (\(1s\) and \(0s\)) within a system. Think of it as a small, high-speed “workspace” inside a processor that holds information temporarily so it can be used immediately. Key Characteristics Storage Element: It is built using Flip-Flops (usually D-type). …