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Ch 27: Magnetic Field and Magnetic Forces
Young & Freedman Calc - University Physics 15th Edition
Young & Freedman Calc15th EditionUniversity PhysicsISBN: 9780135159552Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoYoung & Freedman Calc 15th EditionCh 27: Magnetic Field and Magnetic ForcesProblema 9b
Capitolo 27, Problema 9b

A circular area with a radius of 6.50 cm lies in the xy-plane. What is the magnitude of the magnetic flux through this circle due to a uniform magnetic field B = 0.230 T at an angle of 53.1° from the +z-direction?

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First, understand that magnetic flux (Φ) through a surface is given by the formula: Φ = B * A * cos(θ), where B is the magnetic field, A is the area of the surface, and θ is the angle between the magnetic field and the normal to the surface.
Calculate the area (A) of the circular region. The formula for the area of a circle is A = π * r^2, where r is the radius. Convert the radius from centimeters to meters by dividing by 100, since 1 cm = 0.01 m.
Substitute the given radius (6.50 cm) into the area formula to find A in square meters.
Identify the angle θ. The problem states that the magnetic field is at an angle of 53.1° from the +z-direction. Since the circle lies in the xy-plane, the normal to the surface is along the z-axis. Therefore, θ is the angle between the magnetic field and the normal, which is 53.1°.
Substitute the values of B (0.230 T), A (calculated area), and θ (53.1°) into the magnetic flux formula Φ = B * A * cos(θ) to find the magnitude of the magnetic flux through the circle.

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Magnetic Flux

Magnetic flux quantifies the amount of magnetic field passing through a given area. It is calculated as the product of the magnetic field strength, the area it penetrates, and the cosine of the angle between the field and the normal to the surface. This concept is crucial for understanding how magnetic fields interact with surfaces.
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Magnetic Flux

Dot Product

The dot product is a mathematical operation that multiplies two vectors and returns a scalar. It is used to calculate the component of one vector along the direction of another. In the context of magnetic flux, it helps determine the effective magnetic field passing through a surface by considering the angle between the field and the surface normal.
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Introduction to Dot Product (Scalar Product)

Trigonometry in Physics

Trigonometry is essential in physics for resolving vector components and calculating angles. In this problem, the cosine function is used to find the component of the magnetic field perpendicular to the circular area. Understanding trigonometric relationships allows for accurate calculations of physical quantities like magnetic flux.
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Trigonometry
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