Showing 541 to 550 of 968 Questions
  • A parallel-plate capacitor with area of each plate equal to S and the separation between them to d is put into a stream of con-ducting liquid with resistivity p. The liquid moves parallel to the plates with a constant velocity v. The whole system is located in a uniform magnetic field of induction B, vector B being parallel to the plates

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    132
  • A straight round copper conductor of radius R = 5.0 mm carries a current I = 50 A. Find the potential difference between the axis of the conductor and its surface. The concentration of the conduction electrons in copper is equal to n = 0.9 ∙ 1023 cm-3.

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    132
  • In Hall effect measurements in a sodium conductor the strength of a transverse field was found to be equal to E = 5.0μV/cm with a current density j = 200 A/cm2 and magnetic induction B = = 1.00 T. Find the concentration of the conduction electrons and its ratio to the total number of atoms in the given conductor

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    110
  • Find the mobility of the conduction electrons in a copper conductor if in Hall effect measurements performed in the magnetic field of induction B = 100 mT the transverse electric field strength of the given conductor turned out to be η = 3.1∙103 times less than that of the longitudinal electric field.

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    111
  • A small current-carrying loop is located at a distance r from a long straight conductor with current I. The magnetic moment of the loop is equal to Pm,. Find the magnitude and direction of the force vector applied to the loop if the vector Pm, (a) Is parallel to the straight conductor; (b) Is oriented along the radius vector r; (c) Coinci

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    162
  • A small current-carrying coil having a magnetic moment Pm, is located at the axis of a round loop of radius R with current I flowing through it. Find the magnitude of the vector force applied to the coil if its distance from the centre of the loop is equal to x and the vector Pm coincides in direction with the axis of the loop.

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    127
  • Find the interaction force of two coils with magnetic moments P1m, = 4.0 mA ∙ m2 and P2m, = 6.0 mA ∙ m2 and collinear axes if the separation between the coils is equal to 1 = 20 cm which exceeds considerably their linear dimensions.

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    137
  • A permanent magnet has the shape of a sufficiently thin disc magnetized along its axis. The radius of the disc is R = 1.0 cm. Evaluate the magnitude of a molecular current I' flowing along the rim of the disc if the magnetic induction at the point on the axis of the disc, lying at a distance x = 10 cm from its centre, is equal to B = 30&#

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    127
  • The magnetic induction in vacuum at a plane surface of a uniform isotropic magnetic is equal to B, the vector B forming an angle a with the normal of the surface. The permeability of the magnetic is equal to μ. Find the magnitude of the magnetic induction B' in the magnetic in the vicinity of its surface.

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    160
  • The magnetic induction in vacuum at a plane surface of a magnetic is equal to B and the vector B forms an angle θ with the normal n of the surface (Fig. 3.75). The permeability of the magnetic is equal to μ. Find: (a) The flux of the vector H through the spherical surface S of radius R, whose centre lies on the surface of the

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    110