In Class 12 Boards there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 12 Physics Chapter 5 Magnetism and Matter Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 12 Physics Case Study Questions Magnetism and Matter to know their preparation level.
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In CBSE Class 12 Physics Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Magnetism and Matter Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 12 Physics Chapter 5 Magnetism and Matter
Case Study/Passage-Based Questions
Case Study 1: Earth’s Magnetic Field: The magnetic field of the Earth resembles that of a hypothetical magnetic dipole located at the center of the Earth. The axis of the dipole is presently tilted by approximately 11.3º with respect to the axis of rotation of the earth.
The pole near the geographic North pole of the earth is called the North magnetic pole and the pole near the geographic South pole is called a South magnetic pole.
(i) The strength of the earth’s magnetic field varies from place on the earth’s surface, its value being of the order of
(a) 105 T
(b) 10-6 T
(c) 10-5 T
(d) 108 T
Answer: (c) 10-5 T
(ii) A bar magnet is placed North-South with its North-pole due North. The points of zero magnetic field will be in which direction from centre of magnet?
(a) North-South
(b) East-West
(c) North-East and South-West
(d) None of these
Answer: (b) East-West
(iii) The value of the angle of dip is zero at the magnetic equator because on it
(a) V and H are equal
(b) the values of V and H zero
(c) the value of V is zero
(d) the value of H is zero
Answer: (c) the value of V is zero
(iv) The angle of dip at a certain place, where the horizontal and vertical components of the earth’s magnetic field are equal, is
(a) 30º (b) 90º
(c) 60º (d) 45º
Answer: (d) 45º
(v) At a place, the angle of dip is 30º. If a horizontal component of the earth’s magnetic field is H, then the total intensity of the magnetic field will be
(a) H/2
(b) 2H/√3
(c) H√3/√2
(d) 2H
Answer: (b) 2H/√3
Case Study 2: Gauss’s Law for Magnetism. By analogy to Gauss’s law of electrostatics, we can write Gauss’s law of magnetism as φB→ d s→ = μ0 min side where φB→ d s→ is the magnetic flux and min side is the net pole strength inside the closed surface. We do not have an isolated magnetic pole in nature. At least none has been found to exist to date. The smallest unit of the source of the magnetic field is a magnetic dipole where the net magnetic pole is zero. Hence, the net magnetic pole enclosed by any closed surface is always zero. Correspondingly, the flux of the magnetic field through any closed surface is zero
Question, Consider the two idealised systems
I. a parallel plate capacitor with large plates and small separation and
II. a long solenoid of length L >> R, radius of cross-section.
In I is ideally treated as a constant between plates and zero outside. In II magnetic field is constant inside the solenoid and zero outside. These idealised assumptions, however, contradict fundamental laws as
(a) case I contradicts Gauss’s law for electrostatic fields.
(b) case II contradicts Gauss’s law for magnetic fields.
Answer: (b) case II contradicts Gauss’s law for magnetic fields.
Question. The net magnetic flux through any closed surface, kept in a magnetic field is
Answer: (a) zero
Question. A closed surface S encloses a magnetic dipole of moment 2ml. The magnetic flux emerging from the surface is
(a) μ0m
(b) zero
(c) 2μ0m
(d) 2m/∝0
Answer: (b) zero
Question. Which of the following is not a consequence of Gauss’s law?
(a) The magnetic poles always exist as unlike pairs of equal strength.
(b) If several magnetic lines of force enter in a closed surface, then an equal number of lines of force must leave that surface.
(c) There are abundant sources or sinks of the magnetic field inside a closed surface.
(d) Isolated magnetic poles do not exist.
Answer: (c) There are abundant sources or sinks of the magnetic field inside a closed surface.
Question. The surface integral of a magnetic field over a surface
(a) is proportional to mass enclosed.
(b) is proportional to charge enclosed.
(c) is zero.
(d) equal to its magnetic flux through that surface.
Answer: (d) equal to its magnetic flux through that surface.
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