Giancoli, Physics : Principles with Applications, 5/E Chapter 20 -- MCAT Study Guide

Chapter 20: Magnetism
MCAT Study Guide

In the figure at the right, a very long straight conductor carries a conventional current I_c directed perpendicular to and into the paper.

The direction of the magnetic field at the point in space labeled p₁ due to this current is

perpendicular to and into the paper.

perpendicular to and out of the paper.

toward the bottom of the page.

toward the top of the page.

toward the right side of the page.

toward the left side of the page

In the figure at the right, a very long straight conductor carries a conventional current I_c directed perpendicular to and into the paper.

The direction of the magnetic field at the point in space labeled p₂ due to this current is ___ the page.

perpendicular to and into

perpendicular to and out of

toward the bottom of

toward the top of

toward the right side of

toward the left side of

A very long straight conductor carries a conventional current directed from left to right as in the figure at the right.

The direction of the magnetic field at the point in space labeled A due to this current is ___ the page.

perpendicular to and into

toward the top of

perpendicular to and out of

toward the bottom of

toward the right side of

toward the left side of

A very long straight conductor carries a conventional current directed from left to right as in the figure at the right.

The direction of the magnetic field at the point in space labeled C due to this current is ___ the page.

perpendicular to and into

perpendicular to and out of

toward the bottom of

toward the top of

toward the right side of

toward the left side of

A very long straight conductor carries a conventional current directed from left to right as in the figure at the right.

The direction of the magnetic field at the point in space labeled D due to this current is ___ the page.

perpendicular to and into

perpendicular to and out of

toward the bottom of

toward the top of

toward the right side of

toward the left side of

A long straight overhead conductor carries a steady conventional current from the north toward the south. You stand directly below the wire. The direction of the magnetic field at the location of your head is ___.

east.

west.

north.

south.

upward.

downward

Consider a magnetic field uniform over a large volume of space directed perpendicular to and into the page.

A straight wire lying along the right edge of the paper, carrying a conventional current of 2.0 A directed from the bottom of the page toward the top of the page would experience a force ___ the page.

directed toward the right side of

directed perpendicular to and into

directed perpendicular to and out of

directed toward the top edge of

directed toward the bottom edge of

directed toward the left side of

Consider a magnetic field uniform over a large volume of space directed perpendicular to and into the page.

An electron entering this field moving initially along a line parallel to the top edge of this page from your left toward your right would experience a force ___ the page.

directed toward the right side of

directed perpendicular to and into

directed perpendicular to and out of

directed toward the top edge of

directed toward the bottom edge of

directed toward the left side of

Consider a magnetic field uniform over a large volume of space directed perpendicular to and into the page.

A unionized carbon 12 atom in its ground energy state, upon entering this field moving initially from your left toward your right along the line of print you are now reading, would experience a force ___.

directed toward the right side of

directed perpendicular to and into

directed perpendicular to and out of

directed toward the top edge of

directed in some other way relative to

Geez! Good question, but the force is zero!

10.

Consider a magnetic field uniform over a large volume of space directed from your right toward your left. The plane of this paper is parallel to the magnetic flux lines so that none of the flux lines pass through the paper. Further, one of the flux lines lies along the top edge of the paper.

directed toward the right side of

directed perpendicular to and into

directed perpendicular to and out of

directed toward the top edge of

directed toward the bottom edge of

directed toward the left side of

11.

An electron entering this field moving initially perpendicular to and into the paper would experience a force ___ the page.

directed toward the bottom edge of

directed toward the left side of

directed toward the right side of

directed perpendicular to and into

directed perpendicular to and out of

directed toward the top edge of

12.

A neutron, upon entering this field moving initially from your left toward your right along the line of print you are now reading, would experience a force ___.

directed toward the left side of

directed toward the bottom edge of

directed perpendicular to and into

directed toward the right side of

directed in some other way relative to

Geez! Good question, but the force is zero!

13.

A beam of protons moving with speed v_o enters a uniform magnetic field moving perpendicular to the magnetic field. The protons then move in a circle of radius R_o.

If the speed of the protons was decreased slightly, the radius of the circle on which they move would ___.

increase

decrease

remain constant

be impossible to predict

14.

A beam of protons moving with speed v_o enters a uniform magnetic field moving perpendicular to the magnetic field. The protons then move in a circle of radius R_o.

If the strength of the magnetic field was increased slightly, the work done on the protons by the magnetic field during one revolution in the field would ___.

remain constant

increase

decrease

be impossible to predict

15.

A beam of protons moving with speed v_o enters a uniform magnetic field moving perpendicular to the magnetic field. The protons then move in a circle of radius R_o.

If a beam of electrons moving with the same velocity as these protons was injected into the same magnetic field, the radius of the circle on which the electrons move would be ___ R_o.

equal to

more than

less than

incomparable with

16.

A very long straight wire carries a steady conventional current directed as in the figure at the right. The points in space labeled A through E are equidistant from each other and/or the wire and the magnitude of the magnetic field at the point labeled D is B_o.

The magnitude of the magnetic field at the point labeled E, i.e., |B(E)| = B_o x ___.

1/2

1/3

17.

If the current in the wire was decreased slightly, |B(A)| would ___.

increase

decrease

remain constant

be impossible to predict

18.

The magnetic field at the point labeled C is ___.

directed toward the right side of the paper

directed toward the top edge of the paper

directed toward the bottom edge of the paper

directed perpendicular to and out of the paper

directed perpendicular to and into the paper

directed toward the left side of the page

19.

Consider the magnetic field in the vicinity of two long parallel conductors carrying conventional currents directed as in the figure at the right. The points in space labeled A through F are equidistant from each other and/or the nearer conductor and I₁ = 2 I_o and I₂ = I_o.

Of the labeled points, the magnitude of the magnetic field is largest at the point labeled ___.

20.

increase

remain constant

decrease

be impossible to predict

21.

increase

remain constant

decrease

be impossible to predict

22.

increase

remain constant

decrease

be impossible to predict

23.

Two long straight conductors carry conventional currents directed as in the figure at the right.

The direction of the magnetic force exerted on the conductor with current I₁ is ___ the page.

perpendicular to and into

perpendicular to and out of

toward the bottom of

toward the top of

toward the right side of

toward the left side of

24.

Two long straight conductors carry conventional currents directed as in the figure at the right.

If the magnitude of the current I₁ was increased slightly, the magnitude of the magnetic force exerted on the conductor with current I₂ would ___.

increase

decrease

remain constant

be unpredictable

25.

Two long straight conductors carry conventional currents directed as in the figure at the right.

If the magnitude of the current I₂ was increased slightly, the magnitude of the magnetic force exerted on the conductor with current I₂ would ___.

remain constant

increase

decrease

be unpredictable

26.

Two long straight conductors carry conventional currents directed as in the figure at the right.

If the second conductor was moved a little farther from the first one, the magnitude of the magnetic force exerted on the conductor with current I₂ would ___.

decrease

remain constant

increase

be unpredictable

27.

In the figure at the right, two long parallel conductors carry conventional currents. If the direction of the magnetic force on the first conductor is toward the right side of the page, the direction of the conventional current in the second conductor is ___.

toward the top of the page

toward the bottom of the page

28.

A rectangular current carrying loop lies along side a long straight conductor as in the figure below and to the right. The net magnetic force exerted on the loop by the straight conductor will be ___.

directed toward the wire

directed away from the wire

directed perpendicular to the plane of the current loop

zero

29.

A flat circular coil with radius R_o and no turns is positioned so that the plane of the coil is parallel to a horizontal uniform magnetic field of strength B_o. The coil carries a conventional current of magnitude I_o and experiences a torque of magnitude T_o. If the current in the coil was increased slightly, the magnitude of the torque acting on the coil would ___.

increase

decrease

remain constant

be impossible to predict

30.

A beam of identical particles having a continuous distribution of velocities is passed through a "crossed field velocity selector" and the particles emerging from the velocity selector all have speeds very near v_o. If the magnitude of the magnetic field within the velocity selector was increased slightly, the particles emerging from the velocity selector would have speeds ___ v_o.

less than

more than

equal to

incomparable with

31.

Singly ionized particles with mass m_o move in a circle with radius R_o in the analyzing magnetic field within a mass spectrometer. Other particles, also singly ionized, originating simultaneously from the same test sample and having mass less than m_o will move in a circle with a radius ___ R_o.

equal to

less than

more than

incomparable with

32.

A mixture of ²³⁵U and ²³⁸U atoms are singly ionized in the source of a mass spectrometer, passed through the same velocity selector and then injected at right angles into the field of the analyzing magnet of the spectrometer.

If the ²³⁵U ions move in a circle of radius R₂₃₅, the radius of the circle on which the ²³⁸U atoms move, i. e., R₂₃₈, will be ___ R₂₃₅.

equal to

more than

less than

incomparable with

33.

Two long straight conductors carry conventional currents directed as in the figure at the right.

If the strength of the electric field within the velocity selector section of the mass spectrometer was increased slightly, the ratio R₂₃₅ / R₂₃₈ would ___.

increase

decrease

remain constant

be impossible to predict

34.

Two long straight conductors carry conventional currents directed as in the figure at the right.

If the strength of the electric field within the velocity selector section of the mass spectrometer was increased slightly, the difference R₂₃₈ - R₂₃₅ would ___.

increase

remain constant

decrease

be impossible to predict

Bosworth et al, ARCO MCAT SuperCourse (MacMillan, 1997). Copyright 1997, 1996, 1994, 1991 by Stefan Bosworth, Ronald Drucker, Edgar Schnebel, Denise Garlan, Rosie Soy and Marion Brisk. Used by permission of MacMillan, Inc.

For more information, go to http://www.novapress.net/mcat/books.html.

The Virtual Prof's Physics Study Guide for the MCAT. Copyright 1997 by Glen Terrell and RonJon Publishing, Inc. Used by permission of Glen Terrell. For more information, go to http://www.virtualprof.com.