# Ch 5 Magnetism And Matter NCERT Solutions Class 12 Physics

## NCERT Solutions For Class 12 Physics Chapter 5 Magnetism And Matter

You can download the NCERT Solutions for Class 12 Physics Chapter 5 Magnetism And Matter in PDF below. Prescribed textbook by CBSE for Chapter 5 Magnetism And Matter is standard XII NCERT course book for Physics.

Question 5.1:
Answer the following questions regarding earth’s magnetism:
(a) A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field.
(b) The angle of dip at a location in southern India is about 18º. Would you expect a greater or smaller dip angle in Britain?
(c) If you made a map of magnetic field lines at Melbourne in Australia, would the lines seem to go into the ground or come out of the ground?
(d) In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south pole?
(e) The earth’s field, it is claimed, roughly approximates the field due to a dipole of magnetic moment 8 × 1022 J T−1 located at its centre. Check the order of magnitude of this number in some way.
(f ) Geologists claim that besides the main magnetic N-S poles, there are several local poles on the earth’s surface oriented in different directions. How is such a thing possible at all?
(a) The three independent quantities conventionally used for specifying earth’s magnetic field are:
(i) Magnetic declination,
(ii) Angle of dip, and
(iii) Horizontal component of earth’s magnetic field
(b)The angle of dip at a point depends on how far the point is located with respect to the North Pole or the South Pole. The angle of dip would be greater in Britain (it is about 70°) than in southern India because the location of Britain on the globe is closer to the magnetic North Pole.
(c)It is hypothetically considered that a huge bar magnet is dipped inside earth with its north pole near the geographic South Pole and its south pole near the geographic North Pole.
Magnetic field lines emanate from a magnetic north pole and terminate at a magnetic south pole. Hence, in a map depicting earth’s magnetic field lines, the field lines at Melbourne, Australia would seem to come out of the ground.

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#### NCERT Textbook Solutions, Answers, CBSE Help Book for Unit 5 Magnetism And Matter

Central Board of Secondary Education governs the teaching pattern for XII Physics. For all the schools affiliated to CBSE Prescribed book for Unit 5 Magnetism And Matter is NCERT for Class 12 Physics. NCERT Solutions For Class 12 Physics Unit 5 Magnetism And Matter will help them in preparation for 10th Standard Physics Exams. Aiming at securing high marks with improved basic fundamental knowledge in Physics should be the goal. Important concepts of Unit 5 Magnetism And Matter in PDF is available for free download.