Uchit Patel

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 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

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A magnetic dipole is under the influence of two magnetic fields. The angle between the field directions is 60º, and one of the fields has a magnitude of 1.2 × 10⁻² T. If the dipole comes to stable equilibrium at an angle of 15º with this field, what is the magnitude of the other field?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.21 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 21

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

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

Ashok0210

Asked: February 23, 2021In: Class 12 Physics

A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?

Class 12 Physics CBSE and UP Board Moving Charges and Magnetism Chapter-4 Exercise 4.28 Additional Exercise

Ashok0210

Asked: February 23, 2021In: Class 12 Physics

A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?

Class 12 Physics CBSE and UP Board Moving Charges and Magnetism Chapter-4 Exercise 4.27 Additional Exercise

Uchit Patel

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?

A magnetic dipole is under the influence of two magnetic fields. The angle between the field directions is 60º, and one of the fields has a magnitude of 1.2 × 10⁻² T. If the dipole comes to stable equilibrium at an angle of 15º with this field, what is the magnitude of the other field?

A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?

A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?

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