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If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher

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Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.)

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Would the maximum possible magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation of a

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Explain: Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain: 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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain: ‘A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory?’ Explain the meaning of this

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Explain: What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain: A certain region of space is to be shielded from magnetic fields. Suggest a

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A long straight horizontal cable carries a current of 2.5 A in the direction 10° south of west to 10° north of east. The magnetic meridian of the place happens to be 10° 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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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 we earth’s magnetic field at the place is 0.39 G, and the angle of dip is 35°. The magnetic declination is nearly zero. What are the resultant magnetic fields at points 4.0 cm below the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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 45° with the magnetic meridian. When the current in the coil is 0.35 A, the needle points west to east.(i) Determine the horizontal component of the earth’s magnetic field at the location.(ii) The current in the coil is reversed, and the coil is rotated about its vertical axis by an angle of 90° in the anticlockwise sense looking from above. Predict the direction of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A magnetic dipole is under the influence of two magnetic fields. The angle between the field directions is 60°, 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 15° with this field, what is the magnitude of the other

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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 –31 kg). [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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A proton has spin and magnetic moment just like an electron. Why then its effect is neglected in magnetism of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A permanent magnet in the shape of a thin cylinder of length 10 cm has M = 106 A/m. Calculate the magnetisation current

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain quantitatively the order of magnitude difference between the diamagnetic susceptibility of N2 (~5 × 10–9) (at STP) and Cu

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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