Chapter 20 Review Questions

To the right 5 to the left the charge is moving

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Unformatted text preview: moving parallel to the magnetic field, so it does not the experience any magnetic force. experience Remember that the magnetic force is given by: F = v B sin(θ ) . ↑↑↑↑↑↑↑ v ↑ ↑↑↑↑↑↑↑ q ↑↑↑↑↑↑↑ ↑ F=0 ↑ ↑↑↑↑↑↑↑ ↑ ConcepTest 20.2 Atomic Beams Atomic A beam of atoms enters beam a magnetic field region. What path will the atoms follow? atoms x x x x x x x x x 1x x x xxxxxxxxxxxx xxxxxxxxxxxx 2 xxxxxxxxxxxx xxxxxxxxxxxx 4 xxxxxxxxxxxx 3 ConcepTest 20.2 Atomic Beams Atomic A beam of atoms enters beam a magnetic field region. What path will the atoms follow? atoms x x x x x x x x x 1x x x xxxxxxxxxxxx xxxxxxxxxxxx 2 xxxxxxxxxxxx xxxxxxxxxxxx 4 3 xxxxxxxxxxxx Atoms are neutral objects whose net charge is zero. neutral zero Thus they do not experience a magnetic force. Follow-up: What charge would follow path #3? What about path #1? ConcepTest 20.3 Magnetic Field Magnetic A proton beam enters into a proton magnetic field region as shown below. What is the direction of the magnetic field B? 1) + y 2) – y 2) 3) + x 4) + z (out of page) 4) 5) – z (into page) 5) y x ConcepTest 20.3 Magnetic Field ConcepTest Magnetic A proton beam enters into a proton magnetic field region as shown below. What is the direction of the magnetic field B? 1) + y 2) – y 2) 3) + x 3) 4) + z (out of page) 4) 5) – z (into page) 5) The picture shows the force acting in the +y direction. Applying the y right-hand rule leads to a B field that points into the page. The B into field must be out of the plane out because B ⊥ v and B ⊥ F. x ConcepTest 20.4a Mass Spectrometer I Mass Two particles of the same mass Two same enter a magnetic field with the same speed and follow the paths same shown. Which particle has the bigger charge? bigger 3) both charges are equal xxxxxxxxxxx x xxxxxxxxxxx x xxxxxxxxxxx x xxxxxxxxxxx 1x 2 xxxxxxxxxxx x 4) impossible to tell from the picture xxxxxxxxxxx x ConcepTest 20.4a Mass Spectrometer I ConcepTest Mass Two particles of the same mass Two same enter a magnetic field with the same speed and follow the paths same shown. Which particle has the bigger charge? bigger 3) both charges are equal xxxxxxxxxxx x xxxxxxxxxxx x xxxxxxxxxxx x xxxxxxxxxxx 1x 2 xxxxxxxxxxx x 4) impossible to tell from the picture xxxxxxxxxxx x mv The relevant equation for us is: According to this equation, the R= qB bigger the charge, the smaller the radius. Follow-up: What is the sign of the charges in the picture? ConcepTest 20.10 Current Loop Current 1) left What is the direction of the What 2) right magnetic field at the center 3) zero (point P) of the square loop 4) into the page of current? of 5) out of the page I P ConcepTest 20.10 Current Loop ConcepTest Current What is the direction of the What magnetic field at the center (point P) of the square loop of current? of Use the right-hand rule for each wire segment to find that each segment has its B field pointing out of the page at point P. out 1) left 2) right 3) zero 4) into the page 5) out of the page I P...
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This document was uploaded on 09/24/2013.

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