✓ Board-verified
Physics · 2026 · 2 marks
CBSE 2026 · Region 5 · Set 2 · Q20
A square loop of side 10 cm, free to rotate about a vertical axis coinciding with its one arm, is initially held perpendicular to a uniform…
A square loop of side $\displaystyle 10$ cm, free to rotate about a vertical axis coinciding with its one arm, is initially held perpendicular to a uniform horizontal magnetic field of $\displaystyle 0 \cdot 2$ T. If it is rotated at the uniform speed of $\displaystyle 60$ rpm, find the emf induced in the loop.
Marking-scheme solution
$\displaystyle e=\mathrm{BA} \omega \sin \omega t$
$\displaystyle e=0.2 \times 100 \times 10^{-4} \times 2 \pi \times \sin 2 \pi t$
$\displaystyle e=4 \pi \times 10^{-3} \sin 2 \pi t \mathrm{~V}$
$\displaystyle =12.56 \times 10^{-3} \sin 2 \pi t \mathrm{~V}$
All Electromagnetic Induction questions2026 question paperNCERT solutions: Electromagnetic InductionPractice Electromagnetic Induction →
More from Electromagnetic Induction
- The emf induced in a coil rotating in a magnetic field does not depend upon the following:2024
- Two coplanar concentric circular loops of radii R and r(≪ R) are arranged coaxially. Obtain the expression for their mutual inductance. A square loop…2023
- A square loop of side 50 cm is placed in a uniform magnetic field of 3‧0 T acting perpendicular to the plane of the loop. If the loop is rotated…2026
- A closely wound long solenoid of self-inductance L is cut into two identical solenoids. The value of self-inductance of each small solenoid will be:2026
- Assertion: The mutual inductance between two coils is maximum when the coils are wound on each other. Reason (R): The flux linkage between two coils…2024
- A long solenoid of radius r consists of n turns per unit length. A current I=I_0 sin ω t flows in the solenoid. A coil of N turns is wound tightly…2023
- In the process of charging of a capacitor, the current produced between the plates of the capacitor is:2023
- The magnetic flux linked with a closed coil (in Wb ) varies with time t (in s ) as φ=5 t^2+4 t-2. If the resistance of the circuit is 14 Ω, the…2025
CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.