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- 1. Multiple Choice
A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:
Directed to the right
Directed to the left
Equal to the magnetic field
In the same direction as the magnetic field
- 2. Multiple Choice
The strongest part of a magnet is...
the bars .
the force field.
the poles.
the middle.
- 3. Multiple Choice
Are 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).
- 4. Multiple Choice
The SI unit of magnetic field is
weber
gauss
tesla
farad
- 5. 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 - 6. Multiple ChoiceElectrical currents do NOT create a magnetic field.TrueFalse
- 7. Multiple ChoiceIn the magnetic field equation, what is the variable B?radiuspermeabilitycurrentmagnetic field
- 8. Multiple ChoiceIn the magnetic field equation, what is the variable μ?magnetic fieldcurrentpermeabilityradius
- 9. Multiple ChoiceThe magnetic field is inversely proportional to the radius.TrueFalse
- 10. Multiple ChoiceThe magnetic field is proportional to the current.TrueFalse
- 11. Multiple ChoiceWhat areas of a magnet have the strongest magnetic effect?the middlethe polesthe sidesthe magnetic field lines
- 12. Multiple ChoiceMagnetic poles that are unlike ________and magnetic poles that are alike ___________.run; stayattract; repelstay; repelrepel; attract
- 13. Multiple ChoiceWhat kind of magnet can be turned on and off?refridgerator magnetelectromagnetferromagnetsemimagnet
- 14. 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).
- 15. Multiple Choice
1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:
A. Directed to the right
A. Directed to the left
A. Equal to the magnetic field
In the same direction as the magnetic field
- 16. Multiple Choice
1) The magnetic field inside the coil shown below is directed:
Into the page
Out the Page
To the left
Towards the bottom of the page
- 17. Multiple Choice
1) Two long parallel wires 40 cm apart are carrying currents of 10 A and 20 A in the opposite direction. What is the magnitude of the magnetic field halfway between the wires?
1.0 x 10^-5 T
2.0 x 10^-5 T
3.0 x 10^-5 T
4.0 x 10^-5 T
- 18. Multiple Choice
1) A superconducting wire carries a current of 10^4 A. Find the magnetic field at a distance of 1.0 m from the wire.
2 x 10^-3 T
8 x 10^-3 T
1.6 x 10^-2 T
3.2 x 10^-2 T
- 19. Multiple Choice
1) A straight wire carries a current inside the paper. What is the direction of the magnetic field at point P?
Points to the right
Points to the left
Points to the top of the page
Points to the bottom of the page
- 20. Multiple Choice
1) A 3.25 A current is moving through a loop with 5 turns. What is the radius of the loop that produces a magnetic field of 3.4 x 10^-4 T at its center?
0.03 m
0.25 m
0.50 m
0.75 m
- 21. Multiple Choice
Two parallel wires of length 2 m are separated by 40 cm. If the magnetic force between the two wires is 2 ×10^-6 N and the current in the second wire is twice the current in the first one.
1) Which of the following is true concerning the force between the two wires:
The magnetic force is a repulsion between wires
The magnetic force is an attraction between the wires
- 22. Multiple Choice
1) Two long, parallel wires each carry the same current I in the same direction. Is the total magnetic field at the point midway between the wires:
Zero
Directed into the page
Directed out of the page
Directed to the left
- 23. Multiple Choice
1) A wire carries current I directed to the right as shown in the figure below. What is the direction of the magnetic field generated by the wire at point A?
To the right
To the left
Toward the wire
Into the page
- 24. Multiple Choice
Looking at the field lines in the picture above, the magnets, which orientation is possible?
South - South
North - South
South - North
- 25. Multiple Choice
A force of attraction or repulsion between the poles of two magnets.
magnets
magnetic poles
magnetic force
magnetic fields
- Answer choicesTagsAnswer choicesTags