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11/30/2018 HW6

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HW6
Due: 11:59pm on Saturday, November 10, 2018

You will receive no credit for items you complete after the assignment is due. Grading Policy

Exercise 27.12

A horizontal rectangular surface has dimensions 2.85 by 3.40 and is in a uniform magnetic field that is directed at an
angle of 26.0 above the horizontal.

Part A

What must the magnitude of the magnetic field be to produce a flux of 3.20 10 through the surface?

Express your answer with the appropriate units.

ANSWER:

Exercise 27.22

In a cyclotron, the orbital radius of protons with energy 300 is 16.0 . You are redesigning the cyclotron to be used
instead for alpha particles with energy 300 . An alpha particle has charge 2e and mass 6.64 10 .

Part A

If the magnetic field isn t changed, what will be the orbital radius of the alpha particles?

Express your answer to three significant figures and include the appropriate units.

ANSWER:

Exercise 27.28

Part A

What is the speed of a beam of electrons when the simultaneous influence of an electric field of and a
magnetic field of , with both fields normal to the beam and to each other, produces no deflection of the
electrons?

ANSWER:

Part B

When the electric field is removed, what is the radius of the electron orbit?

cm cm

× −4 Wb

= B

keV cm
keV q = + m = × kg−27

= Rα

1.56 × V/m104

4.62 × T10−3

= v m/s

11/30/2018 HW6

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ANSWER:

Part C

What is the period of the orbit?

ANSWER:

Exercise 27.36

An electromagnet produces a magnetic field of 0.590 in a cylindrical region of radius 2.90 between its poles. A straight
wire carrying a current of 10.7 passes through the center of this region and is perpendicular to both the axis of the cylindrical
region and the magnetic field.

Part A

What magnitude of force is exerted on the wire?

ANSWER:

Exercise 27.46

A coil with a magnetic moment of 1.50 is oriented initially with its magnetic moment antiparallel to a uniform magnetic
field of magnitude 0.845 .

Part A

What is the change in potential energy of the coil when it is rotated 180 so that its magnetic moment is parallel to the field?

ANSWER:

Prelecture Concept Question 27.05

Part A

A charged particle enters into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field
vector. Ignoring the particle’s weight, what type of path will the particle follow?

ANSWER:

= R m

= T s

T cm
A

= F N

A ⋅ m2

T

= U J

11/30/2018 HW6

https://session.masteringphysics.com/myct/assignmentPrintView?displayMode=studentView&assignmentID=6909912 3/5

Conceptual Question 27.07

Part A

A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north. What is
the direction of the magnetic force on this current due to the field?

ANSWER:

Prelecture Concept Question 27.01

Part A

Which of the following statements are true?

Check all that apply.

ANSWER:

The charged particle will follow a circular path.

The charged particle will follow a straight-line path.

The charged particle will follow a parabolic path.

The charged particle will follow a spiral path.

downward

toward the north

toward the south

toward the west

toward the east

Scientists have evidence that single isolated magnetic poles, called magnetic monopoles, exist.

The north pole of a bar magnet will attract the south pole of another bar magnet.

Earth’s geographic south pole is also a magnetic south pole.

The south poles of two bar magnets will repel each other.

Earth’s geographic north pole is actually a magnetic south pole.

The north poles of two bar magnets will attract each other.

11/30/2018 HW6

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Prelecture Concept Question 27.03

Part A

Consider a magnetic force acting on an electric charge in a uniform magnetic field. Which of the following statements are
true?

Check all that apply.

ANSWER:

Conceptual Question 27.05

Part A

Ions having equal charges but masses of and 2 are accelerated through the same potential difference and then enter
a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius , what is the radius of
the arc followed by the lighter?

ANSWER:

Conceptual Question 27.01

The direction of the magnetic force acting on a moving charge in a magnetic field is perpendicular to the
direction of the magnetic field.

A magnetic force is exerted on a stationary electric charge in a uniform magnetic field.

A magnetic force is exerted on an electric charge moving through a uniform magnetic field.

An electric charge moving parallel to a magnetic field experiences a magnetic force.

The direction of the magnetic force acting on a moving electric charge in a magnetic field is perpendicular to the
direction of motion.

An electric charge moving perpendicular to a magnetic field experiences a magnetic force.

M M
R

3R

/R 2√

4R

2√ R

/2R

11/30/2018 HW6

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Part A

An electron moving in the direction of the + -axis enters a magnetic field. If the electron experiences a magnetic deflection
in the – direction, the direction of the magnetic field in this region points in the direction of the

ANSWER:

Problem 27.24

Part A

A straight 15.0-g wire that is 2.00 m long carries a current of 8.00 A. This wire is aligned horizontally along the west-east
direction with the current going from west to east. You want to support the wire against gravity using the weakest possible
uniform external magnetic field.

(a) Which way should the magnetic field point?

ANSWER:

Part B

(b) What is the magnitude of the weakest possible magnetic field you could use?

ANSWER:

Score Summary:
Your score on this assignment is 0.0%.

You received 0 out of a possible total of 12 points.

x
y

– -axis.x

+z-axis.

– -axis.z

+y-axis.

– -axis.y

from east to west

from west to east

from south to north

from north to south

none of the above

T

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