A Flat Rectangular Loop of Wire Is Placed Between the Poles

question 77

Multiple Choice

A flat rectangular loop of wire is placed between the poles of a magnet, as shown in the figure. It has dimensions $w = 0.60 \mathrm {~m}$ and $L = 1.0 \mathrm {~m}$ , and carries a current $I = 2.0 \mathrm {~A}$ in the direction shown. The magnetic field due to the magnet is uniform and of magnitude $0.80 \mathrm {~T}$ . The loop rotates in the magnetic field and at one point the plane of the loop is perpendicular to the field. At that instant, what is the magnitude of the torque acting on the wire due to the magnetic field?

• A) \(0.40 \mathrm {~N} \cdot \mathrm { m }\)
• B) 0.30 N . m
• C) \(0.83 \mathrm {~N} \cdot \mathrm { m }\)
• D) \(0.96 \mathrm {~N} \cdot \mathrm { m }\)
• E) \(0.00 \mathrm {~N} \cdot \mathrm { m }\)

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Definitions:

Low-Density Lipoprotein

Low-density lipoprotein (LDL) is a type of cholesterol often referred to as "bad" cholesterol, which can accumulate in the walls of arteries and contribute to heart disease.

High-Density Lipoprotein

A class of lipoprotein that carries cholesterol away from the arteries to the liver for removal; often referred to as "good" cholesterol.

Lipid

Organic compounds including fats, oils, waxes, and sterols, which are important for energy storage, insulating and protecting organs.

Chylomicrons

Lipoprotein particles that transport dietary lipids from the intestines to other locations in the body.