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Objective: To identify whether positive, negative, or zero work is being done, to identify the force that is doing the work, and to describe the energy transformation associated with such work.

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Electricity and Magnetism, Part 2

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What is the purpose of several items of equipment being used in an electricity and magnetism experiment?

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How are all the variables that were studied related to the amount of induced current?

How are the velocity of the magnet and the diameter of the loop of wire related to the amount of current induced in the wire?

Putting It All Together 2

An NGSS-Inspired Activity.

How is the number of loops of wire related to the amount of current induced in the wire?

Committing to a Cause

How can a magnet be used to induce a current in a loop of wire?

Getting Equipped

Putting It All Together 1

Getting Loopy

Collecting Some Data

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Activity 2: Collecting Some Data Students wanted to explore if a stationary or moving magnet could induce a current in a loop of wire. They created the setup shown and collected the data displayed in the table.

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Physics-Interactives/Static-Electricity/

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Getting Equipped,Collecting Some Data,Committing to a Cause,Getting Loopy,Putting It All Together 1,Putting It All Together 2

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Activity 3: Committing to a Cause After being absent for a lab investigation, a student reviewed the magnetic induction data collected by his lab group during the previous class. His group’s experimental set-up and data table are shown.

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Activity 5: Putting It All Together 1 The class put together their investigations and developed a complex relationship for factors that affect the amount of induced current in a loop by moving a magnet into or out of the loop. The relationship is shown at the right. In the equation, I is the induced current, N is the number of loops of wire, δB/δt is the rate of change of the magnetic field, A is the area of any one of the loops, and R is the electrical resistance of the wire. In this activity, you will identify an investigation that the students could do to demonstrate that induced current depends on each of the variables given in this relationship.

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Activity 4: Getting Loopy Students decided to see if changing the number of loops affects the current induced in the wires when a bar magnet moves toward it. They kept the speed of the bar magnet constant and kept the loop stationary. Their setup is shown. The table below shows the data they collected and their estimated uncertainty for the current measurement.