Podcast
Questions and Answers
What produces a current in dynamic microphones?
What produces a current in dynamic microphones?
- Pressure variations in sound waves (correct)
- Coil of wire around the magnet
- Fixed magnet at the center
- Loudspeaker setup
In dynamic microphones, what causes the coil to move and induce current?
In dynamic microphones, what causes the coil to move and induce current?
- Current flow into the coil
- Fixed magnet at the center
- Pressure variations in sound waves (correct)
- Magnetic field from the coil
Which principle is involved in the operation of dynamic microphones?
Which principle is involved in the operation of dynamic microphones?
- Newton's Third Law
- Ohm's Law
- Boyle's Law
- Fleming's Left Hand Rule (correct)
What interacts to cause the movement of the cone in loudspeakers?
What interacts to cause the movement of the cone in loudspeakers?
What is responsible for producing pressure variations in loudspeakers?
What is responsible for producing pressure variations in loudspeakers?
What happens if the magnetic field changes while a current flows in a conductor?
What happens if the magnetic field changes while a current flows in a conductor?
How is direct current (DC) produced in an electric generator like a dynamo?
How is direct current (DC) produced in an electric generator like a dynamo?
In an alternator, what type of current is produced when the coil of wire rotates between two permanent magnets?
In an alternator, what type of current is produced when the coil of wire rotates between two permanent magnets?
What results from more coils on the secondary coil of a transformer?
What results from more coils on the secondary coil of a transformer?
What happens if the primary current in a transformer is direct current (DC)?
What happens if the primary current in a transformer is direct current (DC)?
What principle states that when a wire cuts through a magnetic field, it induces an electromotive force (emf) or voltage?
What principle states that when a wire cuts through a magnetic field, it induces an electromotive force (emf) or voltage?
What dictates the direction of the magnetic field produced by a current-carrying wire?
What dictates the direction of the magnetic field produced by a current-carrying wire?
In a solenoid, why does having an iron core in the center increase the strength of the magnetic field?
In a solenoid, why does having an iron core in the center increase the strength of the magnetic field?
What rule is used to determine the direction of force felt when a wire carrying current interacts with a magnetic field?
What rule is used to determine the direction of force felt when a wire carrying current interacts with a magnetic field?
What is the relationship between magnetic flux density and the force acting on a current-carrying wire in a magnetic field?
What is the relationship between magnetic flux density and the force acting on a current-carrying wire in a magnetic field?
How does an electric motor generate motion?
How does an electric motor generate motion?
What phenomenon results in a potential difference being induced across a conductor?
What phenomenon results in a potential difference being induced across a conductor?
When there is relative movement between a conductor and a magnetic field, what is induced across the conductor?
When there is relative movement between a conductor and a magnetic field, what is induced across the conductor?
What happens to the force exerted on a wire when its direction is perpendicular to the magnetic field lines?
What happens to the force exerted on a wire when its direction is perpendicular to the magnetic field lines?
What determines the strength of a magnetic field around a wire?
What determines the strength of a magnetic field around a wire?
What shape does the magnetic field in a solenoid resemble?
What shape does the magnetic field in a solenoid resemble?
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