JEE Mains · Physics · STD 12 - 5. Magnetism and matter
Magnetic materials used for making permanent magnets \((P)\) and magnets in a transformer \((T)\) have different properties of the following, which property best matches for the type of magnet required \(?\)
- A \(T\) : Large retentivity, small coercivity
- B \(P\) : Small retentivity, large coercivity
- C \(T\) : Large retentivity, large coercivity
- D \(P :\) Large retentivity, large coercivity
Answer & Solution
Correct Answer
(D) \(P :\) Large retentivity, large coercivity
Step-by-step Solution
Detailed explanation
As for permanent magnet large retentivity and large coercivity required
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 speed of electrons in a scanning electron microscope is \(1 \times 10^{7} \,ms ^{-1}\). If the protons having the same speed are used instead of electrons, then the resolving power of scanning proton microscope will be changed by a factor of:JEE Mains 2021 Medium
- A longitudinal wave is represented by \(x =10 \sin 2 \pi\left( nt -\frac{ x }{\lambda}\right) \,cm\). The maximum particle velocity will be four times the wave velocity if the determined value of wavelength is equal to .....................JEE Mains 2022 Hard
- Match List\(-I\) with List\(-II:\)
Choose the correct answer from the options given below:List\(-I\) List\(-II\) \((A)\) \(3\) Translational degrees of freedom \((I)\) Monoatomic gases \((B)\) \(3\) Translational,\(2\) rotational degrees of freedoms \((II)\) Polyatomic gases \((C)\) \(3\) Translational,\(2\) rotational and \(1\) vibrational degrees of freedom \((III)\) Rigid diatomic gases \((D)\) \(3\) Translational,\(3\) rotational and more than one vibrational degrees of freedom \((IV)\) Nonrigid diatomic gases JEE Mains 2023 Medium - The critical angle of a medium for a specific wavelength, if the medium has relative permittivity \(3\) and relative permeability \(\frac{4}{3}\) for this wavelength, will be.....\(^o\)JEE Mains 2020 Medium
- A physical quantity \(p\) is described by the relation \(p\, = a^{1/2}\, b^2\, c^3\, d^{-4}\) If the relative errors in the measurement of \(a, b, c\) and \(d\) respectively, are \(2\% , 1\%, 3\%\) and \(5\%\), then the relative error in \(P\) will be ........... \(\%\)JEE Mains 2017 Medium
- Find the peak current and resonant frequency of the following circuit (as shown in figure).
JEE Mains 2021 Hard
More PYQs from JEE Mains
- If the potential barrier across a \(p - n\) junction is \(0.6\,V\). Then the electric field intensity, in the depletion region having the width of \(6 \times 10^{-6} m\), will be \(......\times 10^{5} N / C\).JEE Mains 2022 Easy
- The number of \(4 -\)digit numbers which are neither multiple of \(7\) nor multiple of \(3\) is ..... .JEE Mains 2021 Hard
- The distance of the point having position vector \( - \,\hat i\, + \,2\hat j\, + 6\hat k\) from the straight line passing through the point \((2, 3, -4)\) and parallel to the vector \(6\,\hat i\, + 3\hat j\, - 4\hat k\) isJEE Mains 2019 Easy
- An object of mass \(m\) is suspended at the end of a massless wire of length \(L\) and area of cross\(-\)section, \(A\). Young modulus of the material of the wire is \(Y\). If the mass is pulled down slightly its frequency of oscillation along the vertical direction isJEE Mains 2020 Medium
- A \(2\, m\) ladder leans against a vertical wall. If the top of the ladder begins to slide down the wall at the rate \(25\, cm/ sec\)., then the rate (in \(cm/sec\).) at which the bottom of the ladder slides away from the wall on the horizontal ground when the top of the ladder is \(1\, m\) above the ground isJEE Mains 2019 Hard
- Let \(f(x)=x^5+2 x^3+3 x+1, x \in R\), and \(g(x)\) be a function such that \(g(f(x))=x\) for all \(x \in R\). Then \(\frac{g(7)}{g^{\prime}(7)}\) is equal to :JEE Mains 2024 Hard