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Consider the two idealized systems: (i) a parallel plate capacitor with large plates and small separation and (ii) a long solenoid of length L >> R, radius of cross-section. In (i) E is ideally treated as a constant between plates and zero outside. In (ii) magnetic field is constant inside the solenoid and zero outside. These idealised assumptions, however, contradict fundamental laws as

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A paramagnetic sample shows a net magnetisation of 8 Am–1 when placed in an external magnetic field of 0.6T at a temperature of 4K. When the same sample is placed in an external magnetic field of 0.2 T at a temperature of 16K, the magnetisation will

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S is the surface of a lump of magnetic

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The primary origin(s) of magnetism lies

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A long solenoid has 1000 turns per metre and carries a current of 1 A. It has a soft iron core of μr = 1000. The core is heated beyond the Curie temperature,

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Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due

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Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical

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

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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

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

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From molecular view point, discuss the temperature dependence of susceptibility for diamagnetism, paramagnetism and

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A ball of superconducting material is dipped in liquid nitrogen and placed near a bar magnet. In which direction will it

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A ball of superconducting material is dipped in liquid nitrogen and placed near a bar magnet. What will be the direction of it’s magnetic

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Verify the Gauss’s law for magnetic field of a point dipole of dipole moment m at the origin for the surface which is a sphere of radius

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Three identical bar magnets are rivetted together at centre in the same plane as shown in Fig. This system is placed at rest in a slowly varying magnetic field. It is found that the system of magnets does not show any motion. The north-south poles of one magnet is shown in the Fig. Determine the poles of the remaining

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Suppose we want to verify the analogy between electrostatic and magnetostatic by an explicit experiment. Consider the motion of electric dipole p in an electrostatic field E

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Suppose we want to verify the analogy between electrostatic and magnetostatic by an explicit experiment. Consider the motion of magnetic dipole m in a magnetic field B. Write down a set of conditions on E, B, p, m so that the two motions are verified to be identical. (Assume

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A bar magnet of magnetic moment m and moment of inertia I (about centre, perpendicular to length) is cut into two equal pieces, perpendicular to length. Let T be the period of oscillations of the original magnet about an axis through the mid point, perpendicular to length, in a magnetic field B. What would be the similar period T′ for each

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Use (a) the Ampere’s law for H and (b) continuity of lines of B, to conclude that inside a bar magnet, lines of H run from the N pole to S pole,

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Use (a) the Ampere’s law for H and (b) continuity of lines of B, to conclude that inside a bar magnet, lines of B must run from the S pole to N

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

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