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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 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 Presentation

Lesson Video

Lesson Explainer

Lesson Worksheet

Q1:

A circular conducting loop has a radius . 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 -direction. Also shown in the figure are the magnetic field lines from the north pole that intersect the loop at points and .

Which of the following is the direction of the current induced in the loop at point 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 has a radius and 35 turns. The coil is moved so that half of its area is within a uniform magnetic field of strength 0.16 T, directed out of the plane of the diagram shown along the axis of the coil. The coil moves from its old position to its new position in 0.24 s.

What is the magnitude of the electromotive force induced in the coil? Give your answer to two decimal places.

Is the current through the coil clockwise or counterclockwise?