
* To check whether a lightbulb permanently attached to a coil is still good, you place the coil next to another coil that is attached to a battery, as shown in Figure P21.3. Explain how or whether each of the following actions can help you determine if the lightbulb works. (a) Close the switch in circuit A. (b) Keep the switch in circuit A closed (c) Open the switch in circuit A. Indicate any assumptions that you made.

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