Chapter 28: Q 8P (page 829)
Question: An electric field ofand a perpendicular magnetic field of act on a moving electron to produce no net force. What is the electron’s speed?
Short Answer
The electron’s speed is .
Chapter 28: Q 8P (page 829)
Question: An electric field ofand a perpendicular magnetic field of act on a moving electron to produce no net force. What is the electron’s speed?
The electron’s speed is .
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Get started for freeAn electron follows a helical path in a uniform magnetic field given by . At time t = 0, the electron’s velocity is given by .
(a)What is the anglebetween and The electron’s velocity changes with time.
(b) Do its speed change with time?
(c) Do the anglechange with time?
(d) What is the radius of the helical path?
Question: At one instant, is the velocity of a proton in a uniform magnetic fieldAt that instant, what are (a) the magnetic force acting on the proton, in unit-vector notation, (b) the angle between and , and (c) the angle between and ?
In Figure, a metal wire of mass m = 24.1 mg can slide with negligible friction on two horizontal parallel rails separated by distance d = 2.56 cm. The track lies in a vertical uniform magnetic field of magnitude 56.3 mT. At time t = 0, device Gis connected to the rails, producing a constant current i = 9.13 mA in the wire and rails (even as the wire moves). Att = 61.1 ms, (a) what is the wire’s speed? (b) What is the wire’s direction of motion (left or right)?
An electron is moving at in a magnetic field of strength 83.0mT. What is the (a) maximum and (b) minimum magnitude of the force acting on the electron due to the field? (c) At one point the electron has an acceleration ofmagnitude role="math" localid="1662987933736" .What is the angle between the electron’s velocity and the magnetic field?
(a) In Fig. 28-8, show that the ratio of the Hall electric field magnitude E to the magnitude Ecof the electric field responsible for moving charge (the current) along the length of the strip is
where is the resistivity of the material and nis the number density of the charge carriers. (b) Compute this ratio numerically for Problem 13. (See Table 26-1.)
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