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Chapter 22: Q11CQ (page 808)
Which of the particles inFigure 12.47 has the greatest velocity, assuming they have identical charges and masses?
From the diagram, the 'a' particle has a greater radius and a quicker velocity than the 'b' particle.
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(a) Find the charge on a baseball, thrown at\({\rm{35}}{\rm{.0\;m/s}}\)perpendicular to the Earth's\({\rm{5}}{\rm{.00 \times 1}}{{\rm{0}}^{{\rm{ - 5}}}}{\rm{\;T}}\)field, that experiences a 1.00-N magnetic force. (b)What is unreasonable about this result?(c)Which assumption or premise is responsible?
Use the right-hand rules to show that the force between the two loops in Figure 22.49 is attractive if the currents are in the same direction and repulsive if they are in opposite directions. Is this consistent with like poles of the loops repelling and unlike poles of the loops attracting? Draw sketches to justify your answers.
The force on the rectangular loop of wire in the magnetic field in Figure 22.56 can be used to measure field strength. The field is uniform, and the plane of the loop is perpendicular to the field. (a) What is the direction of the magnetic force on the loop? Justify the claim that the forces on the sides of the loop are equal and opposite, independent of how much of the loop is in the field and do not affect the net force on the loop. (b) If a current of 5.00 A is used, what is the force per tesla on the 20.0-cm-wide loop?
Figure 22.56 A rectangular loop of wire carrying a current is perpendicular to a magnetic field. The field is uniform in the region shown and is zero outside that region.
(a) What is the force per meter on a lightning bolt at the equator that carries perpendicular to the Earth’sfield? (b) What is the direction of the force if the current is straight up and the Earth’s field direction is due north, parallel to the ground?
(a) A physicist performing a sensitive measurement wants to limit the magnetic force on a moving charge in her equipment to less than. What is the greatest the charge can be if it moves at a maximum speed ofin the Earth’s field? (b) Discuss whether it would be difficult to limit the charge to less than the value found in (a) by comparing it with typical static electricity and noting that static is often absent.
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