Principles of Physics II

study guides for every class

that actually explain what's on your next test

τ = μb sinθ

from class:

Principles of Physics II

Definition

The equation τ = μb sinθ represents the torque (τ) exerted on a current-carrying wire in a magnetic field. Here, μ is the magnetic moment of the wire, b is the magnitude of the magnetic field, and θ is the angle between the magnetic field and the direction of the current. Understanding this equation helps to analyze how wires interact with magnetic fields and how these interactions can produce rotational motion.

congrats on reading the definition of τ = μb sinθ. now let's actually learn it.

ok, let's learn stuff

5 Must Know Facts For Your Next Test

  1. The torque τ can be maximized when θ is 90 degrees, leading to sinθ being equal to 1.
  2. The unit of torque is typically expressed in Newton-meters (Nm), reflecting its relationship to both force and distance.
  3. Increasing the strength of the magnetic field (b) directly increases the torque exerted on the wire.
  4. The angle θ indicates how effectively the magnetic field interacts with the current; smaller angles reduce torque.
  5. This equation is crucial in applications like electric motors, where torque drives rotation due to current flowing through coils in a magnetic field.

Review Questions

  • How does changing the angle θ affect the torque experienced by a current-carrying wire in a magnetic field?
    • Changing the angle θ affects how effectively the magnetic field interacts with the current. When θ is 90 degrees, sinθ reaches its maximum value of 1, resulting in maximum torque. As θ decreases towards 0 degrees, sinθ approaches 0, leading to decreased torque. Thus, aligning the wire perpendicular to the magnetic field maximizes its torque.
  • In what scenarios would increasing the magnetic moment (μ) be beneficial for maximizing torque in practical applications?
    • Increasing the magnetic moment (μ) enhances the torque experienced by a current-carrying wire because τ is directly proportional to μ. This is particularly beneficial in electric motors or generators where stronger torque leads to better performance. Engineers may increase μ by using more turns of wire in coils or using materials with higher magnetic susceptibility, ultimately improving efficiency and power output.
  • Evaluate how understanding τ = μb sinθ contributes to innovations in electromagnetic devices like motors and generators.
    • Understanding τ = μb sinθ allows engineers and physicists to design more efficient electromagnetic devices such as motors and generators by optimizing their configurations for maximum torque. By manipulating factors such as coil turns, current strength, and magnetic field intensity, innovators can create devices that operate at higher efficiencies and greater outputs. This knowledge leads to advancements in technology, impacting everything from small household appliances to large industrial machines.

"τ = μb sinθ" also found in:

© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.
Glossary
Guides