Lesson: Electromagnetic Interactions in Conducting Loops  Physics • 9th Grade

In this lesson, we will learn how to analyze the current induced in conducting loops by changing magnetic fields and the magnetic field due to a current loop.

Lesson Plan

Students will be able to

  • determine the direction of the magnetic field produced due to a current in a conducting loop,
  • use the formula 𝜀=−𝑁Δ𝐵𝐴Δ𝑡 to relate the emf induced in a conducting coil to the area of its loops, the number of its turns, and the rate of change of magnetic flux linkage,
  • analyze the motion of conducting loops relative to a magnetic field to determine the rate of change of flux linkage.

Lesson Video

Video Thumbnail
15:11

Sample Question Videos

  • 03:01

Lesson Worksheet

Q1:

A circular conducting loop has a radius 𝑟. The north pole of a permanent magnet faces perpendicularly to the plane of the loop, as shown in the diagram. The permanent magnet is moved in the positive 𝑧-direction. Also shown in the figure are the magnetic field lines from the north pole that intersect the loop at points 𝐴 and 𝐵.

Which of the following is the direction of the current induced in the loop at point 𝐴 within the plane of the loop?

Which of the following is the direction of the current induced in the loop at point 𝐵 within the plane of the loop?

Which of the following is the direction of the magnetic field that is produced by the current induced in the loop?

Q2:

A conducting coil with a radius of 4.5 cm has 120 turns. The coil moves perpendicularly to a magnetic field that decreases in strength from 15 mT to 11 mT. A 12.5 mV emf is induced while the coil moves. Find the time for which the coil moves. Give your answer to two decimal places

Q3:

A conducting coil with a radius of 2.5 cm has 150 turns. The coil moves perpendicularly to a magnetic field that becomes stronger at the rate of 1.8 mT/s. Find the magnitude of the electromotive force induced in the coil. Give your answer to two decimal places.

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