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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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What radius circular path does an electron travel if it moves at the same speed and in the same magnetic field as the proton in Exercise \({\rm{22}}{\rm{.13}}\)?
Measurements affect the system being measured, such as the current loop in Figure 22.56
(a) Estimate the field the loop creates by calculating the field at the center of a circular loop 20.0 cm in diameter carrying 5.00A
(b) What is the smallest field strength this loop can be used to measure if its field must alter the measured field by less than0.0100%?
Electric field lines can be shielded by the Faraday cage effect. Can we have magnetic shielding? Can we have gravitational shielding?
Frustrated by the small Hall voltage obtained in blood flow measurements, a medical physicist decides to increase the applied magnetic field strength to get a\({\rm{0}}{\rm{.500}}\;{\rm{V}}\)output for blood moving at\({\rm{30}}{\rm{.0 cm/s}}\)in a\({\rm{1}}{\rm{.50}}\;{\rm{cm}}\)diameter vessel. (a) What magnetic field strength is needed? (b) What is unreasonable about this result? (c) Which premise is responsible?
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鈥檚 magnetic field and a 20.0-mV Hall voltage is induced What is the magnetic field strength?
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