Free AP Physics C lesson

Toroid & Current Loop

This AP Physics C: Electricity & Magnetism lesson is designed for AP Physics C self-study. It includes 3 video lessons, 4 practice questions, and an estimated completion time of 20 minutes.

Video lessons

  1. The Magnetic Field of a Toroid

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  2. The Magnetic Field at the Center of a Current Loop

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  3. The Magnetic Field on the Axis of a Current Loop

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Practice covered

  1. A toroid is a solenoid bent into a doughnut shape. The magnetic field inside a toroid with N total turns at radius r is:
  2. The magnetic field at the center of a circular loop of radius R carrying current I is:
  3. A circular coil with 100 turns, radius 0.10 m, carries 0.50 A. Calculate the magnetic field (in millitesla, mT) at the center. (Use mu_0 = 4pi times 10^-7 T·m/A)
  4. The magnetic field on the axis of a circular loop at distance x from the center (with radius R) is:
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