29. Sources of Magnetic Field

Magnetic Field Produced by Moving Charges

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As a proton passes the origin, its velocity is $3.0 \times 10^{5} m / s$ in the positive x direction. What is the direction of the magnetic field at the point ( $12.0 cm$ , $5.0 cm$ , $0.0 cm$ )?
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Which of the following best describes how electromagnets are similar to other magnets?
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Which part of the $E a r t h$ is primarily responsible for generating the planet's magnetic field?
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Which of the following factors directly determines the strength of the magnetic field produced by a moving point charge at a given location in space?
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Where do magnetic field lines exit the Earth today?
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The amount of current determines the $magnitude$ of the magnetic field when current flows through a conductor. Which property of the magnetic field is directly affected by the current?
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Which of the following best explains what causes an object to be magnetic?
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Which of the following statements correctly describes the direction of the magnetic field lines around a bar magnet?
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When a compass is used near Earth's magnetic north pole, which pole of the compass magnet is attracted to Earth's magnetic north pole?
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As you move a compass around a wire carrying current, what happens to the compass needle?
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A charged particle moving in a magnetic field has a force to the top of the page when it is moving toward the right and the field is into the page. Is this particle positive, negative or neutral?
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As a proton passes the origin, its velocity is $3.0 \times 10^{5} m / s$ in the positive x direction. What is the magnitude of the magnetic field at the point ( $12.0 cm$ , $5.0 cm$ , $0.0 cm$ )?
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