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- 1. Multiple ChoiceA beam of electrons travels at 6.0×106 m/s through a uniform magnetic field of 6.5×10−1 T at right angles to the field. How strong is the force acting on each electron?= 6.25×10−13 N= −6.25×10−13 N= −6.25×10−10 N= −6.25×10−13 M
- 2. Multiple ChoiceA straight wire carrying a 9.0 A current is in a uniform magnetic field oriented at right angles to the wire. When 75 cm of wire is in the field, the force on the wire is 1.2 N. What is the strength of the magnetic field (B)? HINT: F=I.L.B= 0.18 N= 0.18 T= 0.18 Cm= 0.18
- 3. Multiple ChoiceA compass behaves as it does because each needle acts as a(n) ___________.MagnetGuide
- 4. Multiple ChoiceMagnetic poles that are unlike ________and magnetic poles that are alike ___________.run; stayattract; repelstay; repelrepel; attract
- 5. Multiple ChoiceWhat is a magnetic field?purple lines with arrowsarea of magnetic force around a magnetit's like a really big football fieldarea of a magnet around a magnetic force
- 6. Multiple ChoiceThe SI unit of magnetic field isweberguassteslafarad
- 7. Multiple Choice
The strongest part of a magnet is...the bars.the force field.the poles.the middle. - 8. Multiple ChoiceThere are several modern uses of magnets. Magnets allow high speed trains to ______________________ above the track. They go faster because without touching the tracks there is no friction to slow them down.collidelevitateattractrepair
- 9. Multiple ChoiceAre the magnetic field lines in the picture correct?Yes, because they point from north to south.No, because they point from north to south (they're supposed to go the other way).Yes, because the North pole is on the left in all pictures.No, because the North pole is on the left in all pictures (it's supposed to be on the right).
- 10. Multiple ChoiceWhat does the following represent?
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙A crowd with binocularsA bunch of coaxial cablesUniform magnetic field directed into the screen away from youUniform magnetic field directed out of your screen at you - 11. Multiple ChoiceWhat does the following represent?
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗Multiplied by a billionA piece of modern artUniform magnetic field directed into the screen away from youUniform magnetic field directed out of your screen at you - 12. Multiple Choice
A straight wire of length 70 cm carries a current of
50 A and makes an angle of 60° with a uniform
magnetic field. If the force on the wire is 1.0 N what is
the magnitude of B?
20mT
22mT
30mT
33mT
- 13. Multiple Choice
Two long, straight wires are fixed parallel to one
another a distance 𝑑 apart. The wires carry equal
constant currents 𝐼 in the same direction. The
attractive magnetic force per unit length between
them is 𝑓 = 𝐹/𝐿. What is the force per unit length
between the wires if their separation is 2𝑑 and each
carries current 2𝐼?
𝑓/4
3𝑓/2
2𝑓
𝑓/2
- 14. Multiple Choice
Two long parallel wires have currents of 𝐼3 and 𝐼6
6
and are a distance 𝑑 apart. The force per unit length
exerted by one wire on the other is 𝐹/𝐿. The current
in each wire is doubled, and the distance between the
wires is reduced to 𝑑/2. The new force per unit length is
𝐹/2𝐿
8𝐹/𝐿
2𝐹/𝐿
4𝐹/𝐿
- 15. Multiple Choice
Two long, parallel wires each carry the same
current 𝐼 in the same direction. What is the total
magnetic field at the point 𝑃 midway between the
wires?
Zero
Directed into the page
Directed out of the page
Directed to the left
- 16. Multiple Choice
What is the symbol for magnetic field strength?
T
M
B
F
- 17. Multiple Choice
What is the unit for magnetic field strength?
T
M
B
F
- 18. Multiple Choice
Describe the path of a charge moving at right angles in a magnetic field
straight (unchanged)
parabola
circular
sinusoidal
- 19. Multiple ChoiceAn electron is moving north in a region where the magnetic field is south. The magnetic force exerted on the electron is:zeroupnorthsouth
- 20. Multiple ChoiceAn electron and a proton are both initially moving with the same speed and in the same direction at 90˚ to the same uniform magnetic field. They experience magnetic forces, which are initially:identicalequal in magnitude but opposite in directionin the same direction and differing in magnitude by a factor of 1840in opposite directions and differing in magnitude by a factor of 1840
- Answer choicesTagsAnswer choicesTags