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Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A long straight horizontal cable carries a current of 2.5 A in the direction 10º south of west to 10º north of east. The magnetic meridian of the place happens to be 10º west of the geographic meridian. The earth’s magnetic field at the location is 0.33 G, and the angle of dip is zero. Locate the line of neutral points (ignore the thickness of the cable). (At neutral points, magnetic field due to a current-carrying cable is equal and opposite to the horizontal component of earth’s magnetic field.)

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.18 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 18

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

Answer the following questions: (a) Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet. (b) The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetisation, which piece will dissipate greater heat energy? (c) ‘A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory?’ Explain the meaning of this statement. (d) What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern computer? (e) A certain region of space is to be shielded from magnetic fields. Suggest a method.

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.17 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 17

Ashok0210

Asked: February 23, 2021In: Class 12 Physics

A solenoid 60 cm long and of radius 4.0 cm has 3 layers of windings of 300 turns each. A 2.0 cm long wire of mass 2.5 g lies inside the solenoid (near its centre) normal to its axis; both the wire and the axis of the solenoid are in the horizontal plane. The wire is connected through two leads parallel to the axis of the solenoid to an external battery which supplies a current of 6.0 A in the wire. What value of current (with appropriate sense of circulation) in the windings of the solenoid can support the weight of the wire? g = 9.8 m s⁻².

Class 12 Physics CBSE and UP Board Moving Charges and Magnetism Chapter-4 Exercise 4.26 Additional Exercise

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