Chapter 29 Concepts - Magnetic Fields due to Currents

Question 1

discuss the Biot-Savaart Law

Answer 1

allows you to calculate the net magnetic field produced at a point by various distributions of current

Question 2

how do parallel and antiparallel currents relate to one another?

Answer 2

blank currents attract each other while blank currents repel each other

Question 3

define amperian loop

Answer 3

the dot product of magnetic field and ds is on a closed-loop

Question 4

discuss magnetic field inside a long straight wire with current

Answer 4

Inside the wire, magnetic field magnitude is proportional to the amperian radius
At the center, the magnetic field is zero
At the surface, the magnetic field is at its maximum

Question 5

define solenoid

Answer 5

a long tightly wound helical coil of wire

Question 6

discuss the magnetic field for an ideal solenoid

Answer 6

• blank* inside the coil is uniform and parallel to the solenoid axis
• blank* is zero outside the solenoid

Question 7

define toroid

Answer 7

a hollowed blank that has been curved to create a hollow bracelet of coiled wire

Question 8

discuss the magnetic field for toroids

Answer 8

• blank* is not constant over the cross-section of a blank

* blank* is zero outside the blank

Question 9

discuss the two ways that a current-carrying coil can be treated as a magnetic dipole

Answer 9

1) it experiences a torque when we place it in an external magnetic field
2) it generates its own intrinsic magnetic field for distant points along its axis