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Physics 2 ­Ch29                                                       Dr.Hikmat A. Hamad  Page 4  

12. An electron moves in a circular path perpendicular to a uniform magnetic field with a magnitude of 2.00 mT. If the speed of the electron is 1.50 x 107 m/s, determine (a) the radius of the circular path and (b) the time interval required to complete one revolution.

24. A cyclotron designed to accelerate protons has a magnetic field of magnitude 0.450 T over a region of radius 1.20 m. What are (a) the cyclotron frequency and (b) the maximum speed acquired by the protons?

. .

..

. . .

.. /

Physics 2 ­Ch29                                                       Dr.Hikmat A. Hamad  Page 5  

31. A wire carries a steady current of 2.40 A. A straight section of the wire is 0.750 m long and ies along the x axis within a uniform magnetic field, = 1.60 T. If the current is in the positive x direction, what is the magnetic force on the section of wire?

. . ̂ . . ̂