University Physics Volume 2

Conceptual Questions

University Physics Volume 2Conceptual Questions

12.1The Biot-Savart Law

1 .

For calculating magnetic fields, what are the advantages and disadvantages of the Biot-Savart law?

2 .

Describe the magnetic field due to the current in two wires connected to the two terminals of a source of emf and twisted tightly around each other.

3 .

How can you decide if a wire is infinite?

4 .

Identical currents are carried in two circular loops; however, one loop has twice the diameter as the other loop. Compare the magnetic fields created by the loops at the center of each loop.

12.2Magnetic Field Due to a Thin Straight Wire

5 .

How would you orient two long, straight, current-carrying wires so that there is no net magnetic force between them? (Hint: What orientation would lead to one wire not experiencing a magnetic field from the other?)

12.3Magnetic Force between Two Parallel Currents

6 .

Compare and contrast the electric field of an infinite line of charge and the magnetic field of an infinite line of current.

7 .

Is $B→B→$ constant in magnitude for points that lie on a magnetic field line?

12.4Magnetic Field of a Current Loop

8 .

Is the magnetic field of a current loop uniform?

9 .

What happens to the length of a suspended spring when a current passes through it?

10 .

Two concentric circular wires with different diameters carry currents in the same direction. Describe the force on the inner wire.

12.5Ampère’s Law

11 .

Is Ampère’s law valid for all closed paths? Why isn’t it normally useful for calculating a magnetic field?

12.6Solenoids and Toroids

12 .

Is the magnetic field inside a toroid completely uniform? Almost uniform?

13 .

Explain why $B→=0B→=0$ inside a long, hollow copper pipe that is carrying an electric current parallel to the axis. Is $B→=0B→=0$ outside the pipe?

12.7Magnetism in Matter

14 .

A diamagnetic material is brought close to a permanent magnet. What happens to the material?

15 .

If you cut a bar magnet into two pieces, will you end up with one magnet with an isolated north pole and another magnet with an isolated south pole? Explain your answer.

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