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Ashok0210

Asked: February 24, 2021In: Class 12 Physics

If the solenoid in Exercise 5.5 is free to turn about the vertical direction and a uniform horizontal magnetic field of 0.25 T is applied, what is the magnitude of torque on the solenoid when its axis makes an angle of 30° with the direction of applied field?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.6 NCERT Solutions for Class 12 Physics Chapter 5 Question 6

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A closely wound solenoid of 800 turns and area of cross section 2.5 × 10⁻⁴ m² carries a current of 3.0 A. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.5 NCERT Solutions for Class 12 Physics Chapter 5 Question 5

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A short bar magnet of magnetic moment m = 0.32 JT⁻¹ is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which orientation would correspond to its (a) stable, and (b) unstable equilibrium? What is the potential energy of the magnet in each case?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.4 NCERT Solutions for Class 12 Physics Chapter 5 Question 4

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A short bar magnet placed with its axis at 30º with a uniform external magnetic field of 0.25 T experiences a torque of magnitude equal to 4.5 × 10⁻² J. What is the magnitude of magnetic moment of the magnet?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.3 NCERT Solutions for Class 12 Physics Chapter 5 Question 3

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

Answer the following questions: (a) The earth’s magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably? (b) The earth’s core is known to contain iron. Yet geologists do not regard this as a source of the earth’s magnetism. Why? (c) The charged currents in the outer conducting regions of the earth’s core are thought to be responsible for earth’s magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents? (d) The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth’s field in such distant past? (e) The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion? (f) Interstellar space has an extremely weak magnetic field of the order of 10⁻¹² T. Can such a weak field be of any significant consequence? Explain. [Note: Exercise 5.2 is meant mainly to arouse your curiosity. Answers to some questions above are tentative or unknown. Brief answers wherever possible are given at the end. For details, you should consult a good text on geomagnetism.]

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.2 NCERT Solutions for Class 12 Physics Chapter 5 Question 2

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