Potential Energy of a Current Loop: a Rigid Circular Loop

question 59

Multiple Choice

Potential energy of a current loop: A rigid circular loop has a radius of 0.20 m and is in the xy-plane. A clockwise current I is carried by the loop, as shown. The magnitude of the magnetic moment of the loop is 0.75 A ∙ m². A uniform external magnetic field, B = 0.20 T in the positive x-direction, is present. An external torque changes the orientation of the loop from one of lowest potential energy to one of highest potential energy. The work done by this external torque is closest to

• A) 0.20 J
• B) 0.30 J
• C) 0.40 J
• D) 0.50 J
• E) 0.60 J

---

Definitions:

Warranty Expenses

Costs recognized by companies to cover repairs or replacements for customers as part of product warranty agreements.

Inventory Purchases

The buying of goods to be sold in the normal course of business operations.

Sustainable Income

Revenue that can be maintained for the foreseeable future without diminishing resources or opportunities.

Extraordinary Items

Events and transactions that are distinguished by their uncommon nature and by the infrequency of their occurrence, impacting a company's financial statements.