AP EAMCET · PHYSICS · Magnetic Effects of Current
A short bar magnet is placed in a uniform magnetic field of 2 T such that the axis of the magnet makes an angle of \(45^{\circ}\) with the direction of the magnetic field. If the torque acting on the magnet is \(0.36 \sqrt{2} \mathrm{Nm}\), then the moment of the magnet is
- A \(0.54 \mathrm{~J} \mathrm{~T}^{-1}\)
- B \(0.18 \mathrm{~J} \mathrm{~T}^{-1}\)
- C \(0.72 \mathrm{~J} \mathrm{~T}^{-1}\)
- D \(0.36 \mathrm{~J} \mathrm{~T}^{-1}\)
Answer & Solution
Correct Answer
(D) \(0.36 \mathrm{~J} \mathrm{~T}^{-1}\)
Step-by-step Solution
Detailed explanation
\( \tau = M B \sin \theta \) \( 0.36 \sqrt{2} = M \cdot 2 \cdot \sin 45^{\circ} \) \( 0.36 \sqrt{2} = M \cdot 2 \cdot \frac{1}{\sqrt{2}} \) \( M = \frac{0.36 \sqrt{2} \cdot \sqrt{2}}{2} = \frac{0.36 \cdot 2}{2} = 0.36 \mathrm{~J} \mathrm{~T}^{-1} \)
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 readings of the voltmeter and ammeter in the circuit shown in the diagram are respectively
AP EAMCET 2025 Medium - The voltage applied to an electron microscope to produce electrons of wavelength \(0.50 Å\) isAP EAMCET 2021 Medium
- If the pressure on a body is increased from 200 kPa to 250 kPa, the volume of the body decreases by \(0.25 \%\). The compressibility of the material of the body is (in \(\mathrm{m}^2 \mathrm{~N}^{-1}\) )AP EAMCET 2025 Medium
- If some heat is given to a metal of mass 100 g, its temperature rises by \(20^{\circ} \mathrm{C}\). If the same heat is given to 20 g of water, the change in its temperature (in \({ }^{\circ} \mathrm{C}\) ) is (The ratio of specific heat capacities of metal and water is \(1: 10\) )AP EAMCET 2025 Easy
- In the given circuit, current \(I\) is independent of the resistance \(R_6\). Then
AP EAMCET 2018 Easy - X and Y are two circuits having coefficient of mutual inductance 3 mH and resistances \(10 \Omega\) and \(4 \Omega\) respectively. To have induced current \(60 \times 10^{-4} \mathrm{~A}\) in circuit Y , the amount of current to be changed in circuit X in 0.02 sec isAP EAMCET 2024 Hard
More PYQs from AP EAMCET
- How many isomers (cyclic and acyclic) are possible for a compound with molecular formula \(\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}\) ?AP EAMCET 2021 Medium
- If 3 squares are chosen at random from the 64 squares of a chess board, then the probability that all of them lie along the same diagonal line isAP EAMCET 2025 Medium
- The lengths of the sides of the rectangle of greatest area that can be inscribed in the ellipse \(x^2+4 y^2=64\) areAP EAMCET 2020 Easy
- An organic compound \((\mathrm{X})\) has an empirical formula \(\mathrm{C}_4 \mathrm{H}_8 \mathrm{O}\). This gives a pale yellow precipitate with iodine in NaOH solution. What is X ?AP EAMCET 2024 Easy
- The current \(i\) in the circuit given below is
AP EAMCET 2022 Easy - Identify the correct statements from the following:
i. Sulphuric acid is manufactured by contact process.
ii. \(\mathrm{SO}_3\) dissolves in \(\mathrm{H}_2 \mathrm{SO}_4\) to form pyrosulphuric acid.
iii. \(\mathrm{H}_2 \mathrm{SO}_4\) is used in the manufacture of fertilisers such as ammonium sulphate and super phosphate.
iv. In the reaction, \(\mathrm{S}+2 \mathrm{H}_2 \mathrm{SO}_4\) (Conc.)
\(\longrightarrow 3 \mathrm{SO}_2+2 \mathrm{H}_2 \mathrm{O}, \mathrm{H}_2 \mathrm{SO}_4\) is oxidised to \(\mathrm{SO}_2\).AP EAMCET 2019 Easy