Question

1) A permanent magnet has a magnetic dipole moment of 0.170 A · m^2. The magnet is in the presence of an external uniform magnetic field (provided by current-carrying coils) with a magnitude of 0.0800 T, which makes an angle of 35.0° with the orientation of the permanent magnet. (a) What is the magnitude of the torque (in N · m) on the permanent magnet? N · m (b) What is the potential energy (in J) of the system consisting of the permanent magnet and the magnetic field provided by the coils? J 2) An electron moves in a circular path with a speed of 1.21 × 10^7 m/s in the presence of a uniform magnetic field with a magnitude of 1.98 mT. The electron's path is perpendicular to the field. (a) What is the radius (in cm) of the circular path? cm (b) How long (in s) does it take the electron to complete one revolution? s

          1) A permanent magnet has a magnetic dipole moment of 0.170 A · m^2. The magnet is in the presence of an external uniform magnetic field (provided by current-carrying coils) with a magnitude of 0.0800 T, which makes an angle of 35.0° with the orientation of the permanent magnet.
(a) What is the magnitude of the torque (in N · m) on the permanent magnet?
N · m
(b) What is the potential energy (in J) of the system consisting of the permanent magnet and the magnetic field provided by the coils?
J
2) An electron moves in a circular path with a speed of 1.21 × 10^7 m/s in the presence of a uniform magnetic field with a magnitude of 1.98 mT. The electron's path is perpendicular to the field.
(a) What is the radius (in cm) of the circular path?
cm
(b) How long (in s) does it take the electron to complete one revolution?
s

Added by Jeffrey R.

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