Use the Following Figure to Answer the Next Problem $\pi$ $\times$

question 10

Multiple Choice

Use the following figure to answer the next problem:
-The tightly wound toroid shown consists of 100 turns of wire,each carrying a current I = 3 A.If a = 12 cm and b = 15 cm,the magnetic field at r = 13 cm,due to the current in this toroid,is (µ₀ = 4 $\pi$ $\times$ 10^-7 N/A²)

• A)333 µT
• B)462 µT
• C)500 µT
• D)600
• E)zero

---

Definitions:

Low-Ball Technique

Influence technique based on commitment, in which one first gets a person to comply with a seemingly low-cost request and only later reveals hidden additional costs.

Door-In-The-Face Technique

Influence technique based on reciprocity, in which one starts with an inflated request and then retreats to a smaller request that appears to be a concession.

Labeling Technique

Influence technique based on consistency, in which one assigns a label to an individual and then requests a favor that is consistent with the label.

Self-Fulfilling Prophecy

A forecast that, either directly or indirectly, ensures its own accuracy through a positive loop between what is believed and how one acts.