FA20.3-Ampere's Law

Get the Assessment: FA20.3.docx

The assessment solved:

1. What is the magnetic field 3.50 cm to the right of a long straight in the plane of the page wire carrying 120. A? (6.86x10^-4 T into the page)

Use B = (4 pi x10^-7)I/(2 pi r) Refer to your notes or to this powerpoint: 03-01Ampere's Law.pptx

2. There is a magnetic field of 8.20x10^-5 T into the page 12.0 cm to the right of a long straight wire that runs up and down the page. What is the current flowing in the wire, and does it flow up or down the page?

(49.2 A up the page)

Use B = (4 pi x10^-7)I/(2 pi r) Refer to your notes or to this powerpoint: 03-01Ampere's Law.pptx

3. Two straight wires are parallel for 3.40 m at a distance from each other of 15.0 cm. The leftmost has a current of 12.0 A flowing up the page, and the rightmost, a current of 18.0 A flowing down the page. What is the force on the leftmost wire? On the back of this sheet write the complete definition of the Ampere

(9.79x10^-4 N to the left)

Use B = (4 pi x10^-7)I/(2 pi r) and F = IlB Refer to your notes or to this powerpoint: 03-01Ampere's Law.pptx

4. A narrow solenoid is 14.0 cm long and has 112 windings. What is the magnetic field inside if it carries 2.30 A of current? (0.00231 T)

Just like this one: Solenoids Ex #1

5. One of my solenoids is 2.70 cm long, and has 50.0 windings. What current must flow in the wires if we want to create a magnetic field of 1.00 Tesla? (solenoids with iron cores would require much less current)

(430. A)

Just like this one: Solenoids Ex #2