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Ashok0210

Asked: February 24, 2021In: Class 12 Physics

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?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.1 NCERT Solutions for Class 12 Physics Chapter 5 Question 1

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

The magnetic moment vectors µs and µl associated with the intrinsic spin angular momentum S and orbital angular momentum l, respectively, of an electron are predicted by quantum theory (and verified experimentally to a high accuracy) to be given by: µs = –(e/m) S, µl = –(e/2m)l Which of these relations is in accordance with the result expected classically? Outline the derivation of the classical result.

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.25 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 25

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.24 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 24

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A sample of paramagnetic salt contains 2.0 × 10²⁴ atomic dipoles each of dipole moment 1.5 × 10⁻²³ J T⁻¹. The sample is placed under a homogeneous magnetic field of 0.64 T, and cooled to a temperature of 4.2 K. The degree of magnetic saturation achieved is equal to 15%. What is the total dipole moment of the sample for a magnetic field of 0.98 T and a temperature of 2.8 K? (Assume Curie’s law

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.23 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 23

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A monoenergetic (18 keV) electron beam initially in the horizontal direction is subjected to a horizontal magnetic field of 0.04 G normal to the initial direction. Estimate the up or down deflection of the beam over a distance of 30 cm (me = 9.11 × 10⁻¹⁹C). [Note: Data in this exercise are so chosen that the answer will give you an idea of the effect of earth’s magnetic field on the motion of the electron beam from the electron gun to the screen in a TV set.]

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.22 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 22

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A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A?

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