Page 1 of 1

SCS 139: Dr.Prapun Quiz 2

Instructions 1. Separate into groups of no more than three persons.

2. Try not to be in the same group that you have been in before.

3. Only one submission is needed for each group. Late

submission will not be accepted.

4. Write down all the steps that you have done to obtain your

answers. You may not get full credit even when your answer

is correct without showing how you get your answer.

5. Do not panic.

1. A long, straight conductor carries a 2.0 A current. At what distance from the axis of the conductor does the

resulting magnetic field have magnitude B = 410-4 T?

2. In Figure 1, two semicircular arcs have radii R2 = 10 cm and R1 = 5 cm, carry current i = 1 A, and share the

same center of curvature C. What are the (a) magnitude and (b) direction (into or out of the page) of the

net magnetic field at C?

Figure 1: [HRW, 9E, Fig. 29-39]

Name ID

Page 1 of 1

SCS 139: Dr.Prapun Quiz 2

Instructions 1. Separate into groups of no more than three persons.

2. Try not to be in the same group that you have been in before.

3. Only one submission is needed for each group. Late

submission will not be accepted.

4. Write down all the steps that you have done to obtain your

answers. You may not get full credit even when your answer

is correct without showing how you get your answer.

5. Do not panic.

1. A long, straight conductor carries a 3.0 A current. At what distance from the axis of the conductor does the

resulting magnetic field have magnitude B = 310-4 T?

2. In Figure 1, two semicircular arcs have radii R2 = 15 cm and R1 = 10 cm, carry current i = 5 A, and share the

same center of curvature C. What are the (a) magnitude and (b) direction (into or out of the page) of the

net magnetic field at C?

Figure 1: [HRW, 9E, Fig. 29-39]

Name ID

Page 1 of 1

SCS 139: Dr.Prapun Quiz 2

Instructions 1. Separate into groups of no more than three persons.

2. Try not to be in the same group that you have been in before.

3. Only one submission is needed for each group. Late

submission will not be accepted.

4. Write down all the steps that you have done to obtain your

answers. You may not get full credit even when your answer

is correct without showing how you get your answer.

5. Do not panic.

1. Two long straight wires are parallel and 10.0 cm apart. They are to carry equal currents such that the

magnetic field at a point halfway between them has magnitude 200 T. (a) Should the currents be in the

same or opposite directions? (b) How much current is needed?

2. In Figure 1, two circular arcs have radii a = 20 cm and b = 10 cm, subtend angle = 60.0°, carry current i =

0.5 A, and share the same center of curvature P. What are the (a) magnitude and (b) direction (into or out

of the page) of the net magnetic field at P?

Figure 1: [HRW, 9E, Fig. 29-38]

Name ID

Page 1 of 1

SCS 139: Dr.Prapun Quiz 2

Instructions 1. Separate into groups of no more than three persons.

2. Try not to be in the same group that you have been in before.

3. Only one submission is needed for each group. Late

submission will not be accepted.

4. Write down all the steps that you have done to obtain your

answers. You may not get full credit even when your answer

is correct without showing how you get your answer.

5. Do not panic.

1. Two long straight wires are parallel and 60.0 cm apart. They are to carry equal currents such that the

magnetic field at a point halfway between them has magnitude 100 T. (a) Should the currents be in the

same or opposite directions? (b) How much current is needed?

2. In Figure 1, two circular arcs have radii a = 15 cm and b = 10 cm, subtend angle = 36.0°, carry current i = 1

A, and share the same center of curvature P. What are the (a) magnitude and (b) direction (into or out of

the page) of the net magnetic field at P?

Figure 1: [HRW, 9E, Fig. 29-38]

Name ID

Page 1 of 1

SCS 139: Dr.Prapun Quiz 2

Instructions 1. Separate into groups of no more than three persons.

2. Try not to be in the same group that you have been in before.

3. Only one submission is needed for each group. Late

submission will not be accepted.

4. Write down all the steps that you have done to obtain your

answers. You may not get full credit even when your answer

is correct without showing how you get your answer.

5. Do not panic.

1. A surveyor is using a magnetic compass 10 m below a power line in which there is a steady current of 20 A.

What is the magnetic field at the site of the compass due to the power line?

2. In Figure 1, two circular arcs have radii a = 20 cm and b = 10 cm, subtend angle = 45.0°, carry current i =

0.5 A, and share the same center of curvature P. What are the (a) magnitude and (b) direction (into or out

of the page) of the net magnetic field at P?

Figure 1: [HRW, 9E, Fig. 29-38]

Name ID

Page 1 of 1

SCS 139: Dr.Prapun Quiz 2

Instructions 1. Separate into groups of no more than three persons.

2. Try not to be in the same group that you have been in before.

3. Only one submission is needed for each group. Late

submission will not be accepted.

4. Write down all the steps that you have done to obtain your

answers. You may not get full credit even when your answer

is correct without showing how you get your answer.

5. Do not panic.

1. A surveyor is using a magnetic compass 20 m below a power line in which there is a steady current of 30 A.

What is the magnetic field at the site of the compass due to the power line?

2. In Figure 1, two circular arcs have radii a = 20 cm and b = 10 cm, subtend angle = 120.0°, carry current i =

0.5 A, and share the same center of curvature P. What are the (a) magnitude and (b) direction (into or out

of the page) of the net magnetic field at P?

Figure 1: [HRW, 9E, Fig. 29-38]

Name ID