28. Magnetic Fields and Forces

Magnets and Magnetic Fields

Multiple Choice
In the context of Earth's magnetic field, what is one end of a magnetized compass's needle attracted to?
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Multiple Choice
Which set lists three elements that are strongly magnetic (ferromagnetic) at room temperature?
Multiple Choice
In a typical bar magnet, where is the magnetic force the strongest?
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Multiple Choice
If you bring the $north pole$ of one bar magnet close to the $north pole$ of another bar magnet, will these magnets be attracted or repelled?
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Multiple Choice
In the topic of magnets and magnetic fields, how are magnetic field line models helpful?
Multiple Choice
Which part of Earth is primarily responsible for generating Earth’s magnetic field?
Multiple Choice
A bar magnet is placed near the end of a solenoid with its north pole facing the solenoid's south pole. When current flows through the solenoid to create a south magnetic pole at the end closest to the bar magnet, what is the direction of the magnetic force that the solenoid exerts on the bar magnet?
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Multiple Choice
In a typical bar magnet, where is the magnetic force (field strength) strongest?
Multiple Choice
A long straight wire carries a current of $I$ . What is the magnetic field strength at point 1, located a distance $r$ from the wire?
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Multiple Choice
Which statement best describes the magnetic field of Jupiter compared to Earth's magnetic field?
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Multiple Choice
Which of the following devices operates using magnetism rather than electromagnetic radiation?
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Multiple Choice
Which option best completes the following sentence? If a magnet is carefully balanced, as in a compass, the north end of the magnet points roughly toward…
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Multiple Choice
A wire carries a positive current to the left in the plane of this screen. What is the direction of the magnetic field at a point near the top of the screen, still in the plane of the screen?
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Multiple Choice
At what distance from a wire carrying a 10 Acurrent is the magnetic field strength equal to $50 μ T$ ? This is the approximate value of the earth's magnetic field.
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Multiple Choice
Two long parallel wires lie in the $x y$ -plane, each carrying a $5.0$ A current in opposite directions. Wire 1 lies along the $y = 3.0 cm$ line and carries a current in the positive $x$ -direction; wire 2 lies along the $y = 0$ line and carries a current in the negative $x$ -direction. What is the magnitude of the magnetic field at the point $(0 cm, 1 .5 cm, 0 cm)$ ?
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