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Physics 4, Section 2
Feb 21, 2002
1. Gauss’ law for magnetism says the total magnetic flux through a
closed surface
is equal to
A) B/: o inside
B) q/,
o inside
C) : oB
inside
D) 0
2. The MKS unit of magnetic field B is
A) tesla B) coulomb
C) joule D) gauss
3. Which of the following are not always orthogonal to each other (F
= qv H B)?
A) B and v B) B and F
C) F and v
D) none of these pairs
4. If an electron moves horizontally due North through a horizontal B-field
pointed
West, what will be the direction of the force on the electron?
A) up B) down
C) East
D) South
5. To select a particular velocity v of particle in a horizontal
beam of charged
particles moving East the equation used is v = E/B. If the
particles are protons,
and the B-field is directed horizontal north,
what is the direction of the E-field?
A) vertical up B) vertical down
C) horizontal east D) horizontal west
6. If a horizontal beam of electrons is injected into a vertically
downward B-field,
the electrons (as seen from above looking down)
will circle
A) clockwise B) counterclockwise
C) motion is in straight line
7. If F = qv H B, the
maximum force on an electron is attained when the v and B
are
A) parallel
B) anti-parallel
C) orthogonal
D) force independent of angle between v and B
8. In a crossed-field E-B velocity selector, if the
particle beam is changed from
electrons to protons, which of the fields, if
either, should be reversed in direction?
A) E-field B) B-field
C) neither
9. Which of the following does no work?
A) E
B) B
C) neither does work
D) both do work
10. Who made the first accurate measurement of the charge on an electron?
A) Newton
B) Coulomb
C) Thomson
D) Millikan
Answers: 1-d, 2-a, 3-a, 4-b, 5-b, 6-a, 7-c, 8-c,
9-b, 10-d
Last modified on April 25, 2002
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