Showing 461 to 470 of 968 Questions
  • A single square loop of wire 22.0cm on a side is place with its face parallel to the magnetic field between the pole pieces of a larger magnet. When 6.30 A flows in the coil, the torque on it is 0.325m-N. what is the magnetic field strength?

  • A galvanometer needle deflects full scale for a 53.0-μA current. What current will give full-scale deflection if the magnetic field weakens to 0.860 of its original value?

  • If the restoring spring of a galvanometer weakens by 25% over the years, what current will give full-scale deflection if it originally required 36 μA?

  • If the current to a motor drops by 12%, by what factor does the output torque change?

  • Show that the magnetic dipole moment M of an electron orbiting the proton nucleus of a hydrogen atom is related to the orbital angular momentum L of the electron by

  • A circular coil 16.0cm in diameter and containing nine loops lies flat on the ground. The Earth’s magnetic field at this location has magnitude 5.50 X 10-5 T and Points into the Earth at an angle of 56.00 below a line pointing due north. IF a 7.20-A clockwise current passes through the coil,(a) Determine the torque on the coil (b) Which

  • Proton move in a circle of radius 5.10 cm in a 0.566-T magnetic field, what value of electric field could make their paths straight? In what direction must it point?

  • In mass spectrometer, germanium atoms have radii of curvature equal to 21.0, 21.6, 21.9, 22.2, and 22.8, cm. The largest radius corresponds to an atomic mass of 76 u. what are the atomic masses of the other isotopes?

  • Suppose the electric field between the electric plates in the mass spectrometer of Fig. 20-39 is 2.48 X 104 V/m and the magnetic field B = B’ = 0.68 T. The source contains carbon isotopes of mass numbers 12, 13, and 14 from a long-dead piece of a tree (To estimate atomic masses, multiply by 1.67 X 10-27Kg) how par apart are the lines fo

  • A mass spectrometer is being used to monitor air pollutants. It is difficult, however, to separate molecules with nearly equal mass such as CO (28.0106u) and N2 (28.0134u). How large a radius of curvature must a spectrometer have if these two molecules are to be separated on the film by 0.50mm?