CUET · PHYSICS · PYQ PAPER 2025
A wire of length \( L \) meters, carrying a current \( I \) ampere is bent in the form of a circle. The magnitude of its magnetic moment, in SI units, is:
- A \( \frac{IL^2}{\pi} \)
- B \( \frac{IL^2}{2\pi} \)
- C \( \frac{IL^2}{4\pi} \)
- D \( \frac{IL^2}{8\pi} \)
Answer & Solution
Correct Answer
(C) \( \frac{IL^2}{4\pi} \)
Step-by-step Solution
Detailed explanation
\( r = \frac{L}{2\pi} \) \( A = \pi r^2 = \pi \left(\frac{L}{2\pi}\right)^2 = \frac{L^2}{4\pi} \) \( M = IA = I \left(\frac{L^2}{4\pi}\right) = \frac{IL^2}{4\pi} \)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- The magnetic field of a light wave at given time parallel to y-axis and is given by \( B = B_m \sin(kz - \omega t) \). In what direction does the wave travel and parallel to which axis does the associated electric field point at that time?CUET 2023 Hard
- At a certain place on earth, the north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points \( 60^{\circ} \) below the horizontal. The horizontal component of the earth's magnetic field is measured to be 0.16 G. The magnitude of the earth's magnetic field at the location is:CUET 2023 Hard
- Two parallel plate capacitors, X and Y, have the same area of plates and the same separation between them. They are connected in series across a 12 V battery. X has air between the plates while Y contains a dielectric medium of dielectric constant 4. The ratio of electrostatic energy stored in X and Y isCUET 2025 Medium
- The following that is not transported by Electromagnetic waves is :CUET 2023 Medium
- Which of the following are explained in Rutherford's model of an atom?
(A) An atom consists of a core called nucleus.
(B) The nucleus occupies a very small space as compared to the size of atom.
(C) The stability of an atom.
(D) The electrons revolve around the nucleus in various orbits.
Choose the correct answer from the options given below:CUET 2025 Easy - When photons travel through crossed electric and magnetic field, perpendicular to both the fields then they are? Mock Test GenerationCUET 2023 Hard
More PYQs from CUET
- The wavelength of emitted wave due to energy transition in hydrogen atom from n = 3 to n = 2 energy level will beCUET 2023 Medium
- Domain of function \(f(x)=\cos ^{-1} \sqrt{2 x-1}\) is:CUET 2023 Easy
- Read the passage carefully and answer the questions
The coordination compounds are of great importance. These compounds are widely present in the mineral, plants and animal world and are known to play many important functions in the area of analytical chemistry, metallurgy, biological systems, industry and medicine. For example, coordination compounds find use in many qualitative and quantitative chemical analysis. Some important metal extraction and purification make use of complex formation. Hardness of water can be estimated by stable complex formation of Ca\(^{2+}\) and Mg\(^{2+}\)
Wilkinson catalyst used for hydrogenation of alkenes is a complex of ___________.CUET 2025 Medium - In the given figure, the ratio of electric fluxes through surfaces \( S_1 \) and \( S_2 \) is
CUET 2025 Medium - The product (Y) in the following reaction is
\(\text{2 C}_6\text{H}_5\text{CHO} \xrightarrow[\text{Heat}]{\text{conc. NaOH}} \text{Y} + \text{C}_6\text{H}_5\text{COONa}\)CUET 2023 Hard - Identify the most stable complex.CUET 2023 Medium