TS EAMCET · Physics · Magnetic Effects of Current
A short bar magnet of magnetic moment \(2.5 \mathrm{Am}^2\) is kept in a uniform magnetic field of \(4 \times 10^{-5} \mathrm{~T}\). The work done in moving the magnet from its most stable position to most unstable position is
- A \(40 \times 10^{-5} \mathrm{~J}\)
- B \(25 \times 10^{-5} \mathrm{~J}\)
- C \(10 \times 10^{-5} \mathrm{~J}\)
- D \(20 \times 10^{-5} \mathrm{~J}\)
Answer & Solution
Correct Answer
(D) \(20 \times 10^{-5} \mathrm{~J}\)
Step-by-step Solution
Detailed explanation
\(W = -MB(\cos\theta_2 - \cos\theta_1)\) \(W = -(2.5)(4 \times 10^{-5})(\cos 180^\circ - \cos 0^\circ)\) \(W = -(10 \times 10^{-5})(-1 - 1)\) \(W = -(10 \times 10^{-5})(-2)\) \(W = 20 \times 10^{-5} \, \mathrm{J}\)
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 current gain of a transistor is 0.98 . If the transistor is used in a common emitter arrangement what would be the change in collector current corresponding to a change of \(0.5 \mathrm{~mA}\) in the base current?TS EAMCET 2020 Hard
- If \(E, M, J\) and \(G\) respectively denote energy, mass, angular momentum and universal gravitational constant, the quantity, which has the same dimensions as the dimensions of \(\frac{E J^2}{M^5 G^2}\)TS EAMCET 2013 Easy
- A transmitting antenna has a height \(20 \mathrm{~m}\). What will be the height of receiving antenna, if the maximum distance between them for satisfactory communication in line-of-sight (LOS) mode is \(40 \mathrm{~km}\) ? (The earth radius is \(6400 \mathrm{~km}\).)TS EAMCET 2019 Medium
- Two harmonic travelling waves are described by the equations and The amplitude of the superposed wave isTS EAMCET 2018 Easy
- A block of mass \(2 \mathrm{~kg}\) is initially at rest on a horizontal frictionless surface. A horizontal force \(\overrightarrow{\mathbf{F}}=\left(9-x^2\right) \hat{\mathbf{i}}\) newtons acts on it, when the block is at \(x=0\). The maximum kinetic energy of the block between \(x=0\) and \(x=3 \mathrm{~m}\) in joule isTS EAMCET 2004 Medium
- Identify the logic gate for which the output is when any of the inputs isTS EAMCET 2021 Easy
More PYQs from TS EAMCET
- The natural frequency of an \(L-C\) circuit is \(1,25,000 \mathrm{cycle} / \mathrm{s}\). Then the capacitor \(C\) is replaced by another capacitor with a dielectric medium of dielectric constant \(K\). In this case, the frequency decreases by \(25 \mathrm{kHz}\). The value of \(K\) isTS EAMCET 2007 Medium
- In the diode-based rectifier circuit given below, if \(V_s=V_m \sin \omega t\) and the diode is ideal, then the average value of \(V_L\) is
TS EAMCET 2018 Medium - The ends of an element of zinc wire are kept at a small temperature difference \(\Delta T\) and a small current \((I)\) is passed through the wire. Then, the heat developed per unit timeTS EAMCET 2013 Easy
- A voltmeter of \(250 \mathrm{mV}\) range having a resistance of \(10 \Omega\) is converted into an ammeter of \(250 \mathrm{~mA}\) range. The value of necessary shunt is (nearly)TS EAMCET 2015 Easy
- A particle of mass collides with a particle of at rest. After the elastic collision, the two particles moves at an angle of with respect to each other. The ratio isTS EAMCET 2020 Hard
- When monochromatic light falls on a photo-sensitive metal, an electron is emitted with maximum velocity \(1.6 \times 10^6 \mathrm{~m} / \mathrm{s}\). Find the stopping potential. [charge of electron \(=1.6 \times 10^{-19} \mathrm{C}\), mass of electron \(\left.=9 \times 10^{-31} \mathrm{~kg}\right]\)TS EAMCET 2022 Hard