Podcast
Questions and Answers
How does increasing the current in a straight conductor affect the magnetic field around it?
How does increasing the current in a straight conductor affect the magnetic field around it?
- The magnetic field remains unchanged.
- The magnetic field strengthens. (correct)
- The magnetic field disappears.
- The magnetic field weakens.
A current-carrying conductor is placed perpendicular to a uniform magnetic field. What change would result in the greatest increase in the force experienced by the conductor?
A current-carrying conductor is placed perpendicular to a uniform magnetic field. What change would result in the greatest increase in the force experienced by the conductor?
- Reducing both the current and the magnetic field strength by half.
- Halving the current and doubling the magnetic field strength.
- Doubling the current and halving the magnetic field strength.
- Doubling both the current and the magnetic field strength. (correct)
According to Fleming's left-hand rule, what do the thumb, forefinger, and middle finger represent?
According to Fleming's left-hand rule, what do the thumb, forefinger, and middle finger represent?
- Thumb: Force, Forefinger: Current, Middle finger: Magnetic field
- Thumb: Magnetic field, Forefinger: Current, Middle finger: Force
- Thumb: Current, Forefinger: Force, Middle finger: Magnetic field
- Thumb: Force, Forefinger: Magnetic field, Middle finger: Current (correct)
In a simple DC motor, what is the primary function of the commutator?
In a simple DC motor, what is the primary function of the commutator?
Which of the following actions would NOT induce an electromotive force (EMF) in a circuit?
Which of the following actions would NOT induce an electromotive force (EMF) in a circuit?
What is the effect of increasing the number of turns of wire in a coil when inducing an EMF by moving a magnet in and out of the coil?
What is the effect of increasing the number of turns of wire in a coil when inducing an EMF by moving a magnet in and out of the coil?
How does the speed at which a magnet is moved relative to a coil affect the induced EMF?
How does the speed at which a magnet is moved relative to a coil affect the induced EMF?
A coil with a fixed number of turns is placed in a changing magnetic field. Which adjustment would likely result in the smallest increase to EMF?
A coil with a fixed number of turns is placed in a changing magnetic field. Which adjustment would likely result in the smallest increase to EMF?
If a current-carrying wire is aligned parallel to the magnetic field, what is the magnitude of the force acting on the wire?
If a current-carrying wire is aligned parallel to the magnetic field, what is the magnitude of the force acting on the wire?
A copper wire is moved at a constant speed through a uniform magnetic field. Which change will induce a larger EMF in the wire?
A copper wire is moved at a constant speed through a uniform magnetic field. Which change will induce a larger EMF in the wire?
Flashcards
Magnetic Field Around a Conductor
Magnetic Field Around a Conductor
Electric current produces a magnetic field around the conductor.
Force on Current-Carrying Conductor
Force on Current-Carrying Conductor
A force acts on a conductor when it carries current in a magnetic field.
Torque on a Coil
Torque on a Coil
A current-carrying coil in a magnetic field experiences a torque, causing it to rotate.
Fleming's Left Hand Rule
Fleming's Left Hand Rule
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DC Motor Action
DC Motor Action
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Electromagnetic Induction
Electromagnetic Induction
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Factors Affecting Induced e.m.f.
Factors Affecting Induced e.m.f.
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Study Notes
- An electric current in a conductor generates a magnetic field around it.
- A force acts on a current-carrying conductor when placed in a magnetic field.
- A current-carrying coil in a magnetic field experiences torque.
Fleming’s Left-Hand Rule
- Used to determine the direction of the force on a current-carrying conductor in a magnetic field.
DC Motor Action
- The turning effect on a coil due to the magnetic force relates to the action of a DC motor.
Induced e.m.f.
- A changing magnetic field can induce e.m.f. in a circuit.
Factors Affecting Magnitude of Induced e.m.f.
- The magnitude of the induced e.m.f. is affected by several factors.
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