Chapter 4: Q8DQ (page 911)
How might a loop of wire carrying a current be used as a compass? Could such a compass distinguish between north and south? Why or why not?
We would have to know the direction of the current in the loop in order to determine where is north and where is south.
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A beam of protons traveling at 1.20 km/s enters a uniform magnetic field, traveling perpendicular to the field. The beam exits the magnetic field, leaving the field in a direction pependicurlar to its original direction (Fig. E27.24). The beam travels a distance of 1.10 cm while in the field. What is the magnitude of the magnetic field?
Lightning Strikes. During lightning strikes from a cloud to the
ground, currents as high as 25,000 A can occur and last for about 40 ms.
How much charge is transferred from the cloud to the earth during such a
strike?
An electron moves at through a regionin which there is a magnetic field of unspecified direction and magnitude . (a) What are the largest and smallest possible magnitudes of the acceleration of the electron due to the magnetic field? (b) If the actual acceleration of the electron is one-fourth of the largest magnitude in part (a), what is the angle
between the electron velocity and the magnetic field?
(See Discussion Question Q25.14.) Will a light bulb glow more brightly when it is connected to a battery as shown in Fig. Q25.16a, in which an ideal ammeter is placed in the circuit, or when it is connected as shown in Fig. 25.16b, in which an ideal voltmeter V is placed in the circuit? Explain your reasoning.
Could an accelerator be built in which all the forces on the particles, for steering and for increasing speed, are magnetic forces? Why or why not?
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