The diagram shows one plate of a parallel-plate capacitor from within the capacitor. The plate is circular and has radius R. The dashed circles are four integration paths have radii of r1 = R/4, r2 = R/2, r3 =3 R/2, and r4 = 2R. Rank the paths according to the magnitude of around the paths during the discharging of the capacitor, least to greatest.

A) 1, 2 and 3 tie, then 4 B) 1, 2, 3, 4 C) 1, then 2 and 4 tie, then 3 D) 4, 3, 1, 2 E) all tie A) 1, 2 and 3 tie, then 4 B) 1, 2, 3, 4 C) 1, then 2 and 4 tie, then 3 D) 4, 3, 1, 2 E) all tie

Exam 32: Maxwells Equations; Magnetism of Matter

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Suppose you are looking into one end of a long cylindrical tube in which there is a uniform electric field, pointing away from you. If the magnitude of the field is decreasing with time the direction of the induced magnetic field is:

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Question 21

Magnetic dipole X is fixed and dipole Y free to move. Dipole Y will initially:

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Question 22

An electric field exists in the cylindrical region shown and is parallel to the cylinder axis. The magnitude of the field might vary with time according to any of the four graphs shown. Rank the four variations according to the magnitudes of the magnetic field induced at the edge of the region, least to greatest.

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Question 23

An electron traveling with speed v around a circle of radius r is equivalent to a current of:

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Question 24

A magnetic field is applied to a paramagnetic substance. In the interior the magnetic field produced by the magnetic dipoles of the substance is:

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Question 25

Paramagnetism is closely associated with:

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Question 26

Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic, and ferromagnetic) which are used to make permanent magnets?

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Question 27

The intrinsic magnetic dipole moments of protons and neutrons are much less than that of an electron because:

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Question 28

A bar magnet is broken in half. Each half is broken in half again, etc. The observation is that each piece has both a north and south pole. This is usually explained by:

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Question 29

Displacement current exists in the region between the plates of a parallel plate capacitor if:

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Question 30

The diagram shows one plate of a parallel-plate capacitor from within the capacitor. The plate is circular and has radius R. The dashed circles are four integration paths have radii of r₁ = R/4, r₂ = R/2, r₃ =3 R/2, and r₄ = 2R. Rank the paths according to the magnitude of around the paths during the discharging of the capacitor, least to greatest.

(Multiple Choice)

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Question 31

The magnetic field lines due to an ordinary bar magnet:

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Question 32

A cylindrical region contains a uniform electric field that is along the cylinder axis and is changing with time. If r is the distance from the cylinder axis the magnitude of the magnetic field within the region is:

(Multiple Choice)

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Question 33

An electron is on the z axis moving toward the xy plane but it has not reached that plane yet. At that instant:

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Question 34

Of the following places one would expect that the horizontal component of the Earth's magnetic field to be largest in:

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Question 35

A paramagnetic substance, in an external magnetic field, is thermally isolated. The field is then removed. As a result:

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Question 36

The energy of a magnetic dipole in an external magnetic field is least when:

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Question 37

Suppose you are looking into one end of a long cylindrical tube in which there is a uniform electric field, pointing away from you. If the magnitude of the field is decreasing with time the field lines of the induced magnetic field are:

(Multiple Choice)

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Question 38

If an electron has zero orbital angular momentum, the magnitude of its magnetic dipole moment equals:

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Question 39

Two of Maxwell's equations contain an integral over a closed surface. For them the infinitesimal vector area is always:

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Question 40

Showing 21 - 40 of 81

Exam 32: Maxwells Equations; Magnetism of Matter

Suppose you are looking into one end of a long cylindrical tube in which there is a uniform electric field, pointing away from you. If the magnitude of the field is decreasing with time the direction of the induced magnetic field is:

Magnetic dipole X is fixed and dipole Y free to move. Dipole Y will initially:

An electron traveling with speed v around a circle of radius r is equivalent to a current of:

A magnetic field is applied to a paramagnetic substance. In the interior the magnetic field produced by the magnetic dipoles of the substance is:

Paramagnetism is closely associated with:

Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic, and ferromagnetic) which are used to make permanent magnets?

The intrinsic magnetic dipole moments of protons and neutrons are much less than that of an electron because:

A bar magnet is broken in half. Each half is broken in half again, etc. The observation is that each piece has both a north and south pole. This is usually explained by:

Displacement current exists in the region between the plates of a parallel plate capacitor if:

The magnetic field lines due to an ordinary bar magnet:

A cylindrical region contains a uniform electric field that is along the cylinder axis and is changing with time. If r is the distance from the cylinder axis the magnitude of the magnetic field within the region is:

An electron is on the z axis moving toward the xy plane but it has not reached that plane yet. At that instant:

Of the following places one would expect that the horizontal component of the Earth's magnetic field to be largest in:

A paramagnetic substance, in an external magnetic field, is thermally isolated. The field is then removed. As a result:

The energy of a magnetic dipole in an external magnetic field is least when:

Suppose you are looking into one end of a long cylindrical tube in which there is a uniform electric field, pointing away from you. If the magnitude of the field is decreasing with time the field lines of the induced magnetic field are:

If an electron has zero orbital angular momentum, the magnitude of its magnetic dipole moment equals:

Two of Maxwell's equations contain an integral over a closed surface. For them the infinitesimal vector area is always:

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