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Chapter 22: Q21CQ (page 809)
Is the force attractive or repulsive between the hot and neutral lines hung from power poles? Why?
Force will be repulsive between the hot and neutral lines hung from power poles.
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A patient with a pacemaker is mistakenly being scanned for an MRI image. A 10.0-cm-long section of pacemaker wire moves at a speed of 10.0 cm/s perpendicular to the MRI unit’s magnetic field and a 20.0-mV Hall voltage is induced What is the magnetic field strength?
A proton moves at\({\rm{7}}{\rm{.50 \times 1}}{{\rm{0}}^{\rm{7}}}{\rm{ m/s}}\)perpendicular to a magnetic field. The field causes the proton to travel in a circular path of radius\({\rm{0}}{\rm{.800 m}}\). What is the field strength?
How can the motion of a charged particle be used to distinguish between a magnetic and an electric field?
What force is exerted on the water in an MHD drive utilizing a-diameter tube, iflocalid="1654594579558" current is passed across the tube that is perpendicular to alocalid="1654594587153" magnetic field? (The relatively small size of this force indicates the need for very large currents and magnetic fields to make practical MHD drives.)
If you have three parallel wires in the same plane, as in Figure 22.48, with currents in the outer two running in opposite directions, is it possible for the middle wire to be repelled by both? Attracted by both? Explain.
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