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Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A compass needle free to turn in a horizontal plane is placed at the centre of circular coil of 30 turns and radius 12 cm. The coil is in a vertical plane making an angle of 45º with the magnetic meridian. When the current in the coil is 0.35 A, the needle points west to east. (a) Determine the horizontal component of the earth’s magnetic field at the location. (b) The current in the coil is reversed, and the coil is rotated about its vertical axis by an angle of 90º in the anticlockwise sense looking from above. Predict the direction of the needle. Take the magnetic declination at the places to be zero.

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.20 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 20

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A telephone cable at a place has four long straight horizontal wires carrying a current of 1.0 A in the same direction east to west. The earth’s magnetic field at the place is 0.39 G, and the angle of dip is 35º. The magnetic declination is nearly zero. What are the resultant magnetic fields at points 4.0 cm below the cable?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.19 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 19

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

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