23.1 Induced Emf and Magnetic Flux The apparatus used by Faraday to demonstrate that magnetic fields can create currents is illustrated in Figure 23.3. When the switch is closed, a magnetic field is produced in the coil on the top part of the iron ring and transmitted to the coil on the bottom part of the ring. The galvanometer is used to detect any current induced in the coil on the bottom. It was found that each time the switch is closed, the galvanometer detects a current in one direction in the coil on the bottom. (You can also observe this in a physics lab.) Each time the switch is opened, the galvanometer detects a current in the opposite direction. Interestingly, if the switch remains closed or open for any length of time, there is no current through the galvanometer. Closing and opening the switch induces the current. It is the change in magnetic field that creates the current. More basic than the current that flows is the emfthat causes it. The current is a result of an emf induced by a changing magnetic field, whether or not there is a path for current to flow. Galvanometer Iron Battery Figure 23.3 Faraday's apparatus for demonstrating that a magnetic field can produce a current. A change in the field produced by the top coil induces an emf and, hence, a current in the bottom coil. When the switch is opened and closed, the galvanometer registers currents in opposite directions. No current flows through the galvanometer when the switch remains closed or open.
23.1 Induced Emf and Magnetic Flux The apparatus used by Faraday to demonstrate that magnetic fields can create currents is illustrated in Figure 23.3. When the switch is closed, a magnetic field is produced in the coil on the top part of the iron ring and transmitted to the coil on the bottom part of the ring. The galvanometer is used to detect any current induced in the coil on the bottom. It was found that each time the switch is closed, the galvanometer detects a current in one direction in the coil on the bottom. (You can also observe this in a physics lab.) Each time the switch is opened, the galvanometer detects a current in the opposite direction. Interestingly, if the switch remains closed or open for any length of time, there is no current through the galvanometer. Closing and opening the switch induces the current. It is the change in magnetic field that creates the current. More basic than the current that flows is the emfthat causes it. The current is a result of an emf induced by a changing magnetic field, whether or not there is a path for current to flow. Galvanometer Iron Battery Figure 23.3 Faraday's apparatus for demonstrating that a magnetic field can produce a current. A change in the field produced by the top coil induces an emf and, hence, a current in the bottom coil. When the switch is opened and closed, the galvanometer registers currents in opposite directions. No current flows through the galvanometer when the switch remains closed or open.
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Induced Emf and Magnetic Flux
• Calculate the flux of a uniform magnetic field through a loop of arbitrary orientation.
• Describe methods to produce an electromotive force (emf) with a magnetic field or magnet and a loop of wire.
Transcribed Image Text:23.1 Induced Emf and Magnetic Flux
The apparatus used by Faraday to demonstrate that magnetic fields can create currents is illustrated in Figure 23.3. When the
switch is closed, a magnetic field is produced in the coil on the top part of the iron ring and transmitted to the coil on the bottom
part of the ring. The galvanometer is used to detect any current induced in the coil on the bottom. It was found that each time the
switch is closed, the galvanometer detects a current in one direction in the coil on the bottom. (You can also observe this in a
physics lab.) Each time the switch is opened, the galvanometer detects a current in the opposite direction. Interestingly, if the
switch remains closed or open for any length of time, there is no current through the galvanometer. Closing and opening the
switch induces the current. It is the change in magnetic field that creates the current. More basic than the current that flows is the
emfthat causes it. The current is a result of an emf induced by a changing magnetic field, whether or not there is a path for
current to flow.
Transcribed Image Text:Galvanometer
Iron
Battery
Figure 23.3 Faraday's apparatus for demonstrating that a magnetic field can produce a current. A change in the field produced by the top coil induces
an emf and, hence, a current in the bottom coil. When the switch is opened and closed, the galvanometer registers currents in opposite directions. No
current flows through the galvanometer when the switch remains closed or open.
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