Magnetic Fields

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).

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The strongest part of a magnet is...

• the bars .

• the force field.

• the poles.

• the middle.

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The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

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A ________ is a device that has a magnet on a needle that spins freely. It is used for navigation because its needle usually points north.

• calculator

• ruler

• compass

• map

In this image, matching north poles from two magnets are introduced.  What do you predict will be the outcome?

• There will be no interaction.  The poles of magnets do not have an effect on one another.
• The two north poles will attract each other
• The two north poles will repel each other
• The two magnets will combine and become one magnet

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Looking at the field lines in this picture, these two magnets are ________

• Attracting

• Repelling

• Attracting and Repelling

• Doing nothing

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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

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How could you increase the strength of a magnetic field in a coil?

• use an iron core, decrease the number of turns of wire

• increase the voltage and decrease the number of turns

• use an iron core and increase the size of the current

• increase the number of turns and decrease the current

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A magnetic field is the field of magnetic lines of force produced by current-carrying conductors or permanent magnets. Which statement about magnetic lines of force is not true?

• The magnetic lines of force always emanate from the North pole along a curved path outside the magnet to the South pole.

• The direction of magnetic lines of force inside the magnet is from North pole to South pole.

• The magnetic lines of force outside the magnet do not intersect with each other.

• The magnetic lines of force in a uniform magnetic field are parallel and equidistant.

Which of the following will not influence the magnetic force acting on a current-carrying conductor?

• The current flowing in the conductor

• Length of the conductor

• Magnetic field strength

• The speed of the conductor