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Questions and Answers
What is the relationship between electric and magnetic fields, according to the text?
What is the relationship between electric and magnetic fields, according to the text?
- They are inter-related and called electromagnetic fields. (correct)
- Magnetic fields create electric fields, but not vice versa.
- Electric fields create magnetic fields, but not vice versa.
- They are completely independent of each other.
A stationary charge will produce both an electric and a magnetic field.
A stationary charge will produce both an electric and a magnetic field.
False (B)
According to Faraday's experiment, a changing magnetic field induces a current due to the production of ______.
According to Faraday's experiment, a changing magnetic field induces a current due to the production of ______.
EMF
What instrument is used to measure magnetic fields?
What instrument is used to measure magnetic fields?
Match the field with what creates it:
Match the field with what creates it:
In Faraday's apparatus, what happens when the switch remains either closed or open for an extended period?
In Faraday's apparatus, what happens when the switch remains either closed or open for an extended period?
The direction of a magnetic field is indicated by lines representing the flow of negative charges.
The direction of a magnetic field is indicated by lines representing the flow of negative charges.
What is produced in the top coil of the iron ring in Faraday's apparatus when the switch is closed?
What is produced in the top coil of the iron ring in Faraday's apparatus when the switch is closed?
Electric fields are measured in units of ______, according to the text.
Electric fields are measured in units of ______, according to the text.
Match the following descriptions with the correct field:
Match the following descriptions with the correct field:
Flashcards
Moving Charge Fields
Moving Charge Fields
An object with a moving charge possesses both magnetic and electric fields which are inter-related.
Magnetic Field
Magnetic Field
The area around a magnetic force, obtained by moving electric charges. Its direction is indicated by lines.
Magnetic Field Source
Magnetic Field Source
Created by electric charges in surrounding magnets.
Electric Field Source
Electric Field Source
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Magnetic Field Units
Magnetic Field Units
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Measurement of Magnetic Field
Measurement of Magnetic Field
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Induced EMF
Induced EMF
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Faraday's Apparatus
Faraday's Apparatus
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Study Notes
- The magnetic field is an area around the magnetic force.
- Magnetic fields are obtained by moving electric charges.
- The direction of the magnetic field is indicated by lines.
- Electric fields are generated around particles that obtain electric charge.
- Positive charges are drawn, while negative charges are repelled during electric charge.
- A moving charge has both magnetic and electric fields.
- Electromagnetic fields are inter-related but independent.
Electric vs. Magnetic Fields
- Electric fields are created by magnetic charge in surrounding magnets, while magnetic fields are created by an electric charge around moving magnets.
- Electric fields are measured in newtons per coulomb, volt per meter, while magnetic fields are measured as gauss or tesla.
- Electric fields are proportional to the electric charge, while magnetic fields are proportional to the speed of electric charge.
- Electric fields are perpendicular to the magnetic field and are measured using an electrometer, while magnetic fields are perpendicular to the electric field and are measured using a magnetometer.
Induced EMF
- Magnetic fields can create currents.
- When the switch is closed, a magnetic field is produced in the coil of the iron ring and transmitted to the coil on the bottom part of the ring.
- A galvanometer detects any current induced in a separate coil on the bottom.
- Faraday's apparatus demonstrates that a magnetic field can produce a current.
- A change in the field induces an EMF and a current in the bottom coil.
- The galvanometer registers currents in opposite directions when the switch is opened and closed.
- No current flows through the galvanometer when the switch remains closed or open.
- Closing the switch causes the galvanometer to detect a current in one direction.
- Opening the switch causes the galvanometer to detect a current in the opposite direction.
- If the switch remains closed or open, there is no current.
- Closing and opening the switch induces current.
- A change in magnetic field creates the current.
- Electromotive force (EMF) causes the current, and current results from an EMF induced by a changing magnetic field.
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