AP Physics C: Electricity and Magnetism Flashcards: Induced Currents and Magnetic Forces
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
Which fundamental law of motion can be applied to analyze a conducting loop that is moving in a magnetic field and experiencing an induced emf?
Newton’s second law can be applied to the conducting loop to describe its motion under the influence of the magnetic force from the induced current.
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Which fundamental law of motion can be applied to analyze a conducting loop that is moving in a magnetic field and experiencing an induced emf?
Newton’s second law can be applied to the conducting loop to describe its motion under the influence of the magnetic force from the induced current.
If a conducting loop experiences a net magnetic force due to an induced current, what principle can be used to determine its resulting acceleration?
Newton's second law (F=ma) can be applied, where F is the net magnetic force on the loop, to determine the loop's acceleration.
What is the source of the magnetic force exerted on a conductor that has an induced current?
The force is exerted by an external, already-present magnetic field on the moving charge carriers that make up the induced current within the conductor.
What is the equation for the magnetic force ($\vec{F}_{B}$) on a conductor of length $\vec{l}$ carrying current $I$ in a magnetic field $\vec{B}$?
The magnetic force on the conductor is given by the equation $\vec{F}_{B}=I\vec{l}\times\vec{B}$.
When an induced current is created in a conductive loop, on what specifically does the external magnetic field exert a force?
The external magnetic field exerts a magnetic force directly on the moving charge carriers within the loop which constitute the induced current.
What is the relationship between an induced electromotive force (emf) and the magnetic force on a conducting loop?
An induced emf drives an induced current, and it is this current, moving through an external magnetic field, that results in a magnetic force on the loop.
A segment of a conductive loop has an induced current $I$. How would you use the equation $\vec{F}_{B}=I\vec{l}\times\vec{B}$ to find the force on it?
You would identify the vector for the length of the segment ($\vec{l}$) in the direction of the current $I$ and calculate its cross product with the external magnetic field vector ($\vec{B}$).
Explain the interaction that produces a force on a conductor with an induced current.
A force is produced due to the interaction between an external magnetic field and the induced current flowing within the conductor.
Define 'induced current' in the context of a conductive loop in a magnetic field.
An induced current is the flow of charge created within a conductive loop when it experiences a change in magnetic flux, for example, by moving through a magnetic field.
Does the force on the conductor act on the conductor itself or on the charges within it?
The magnetic force acts directly on the moving charge carriers (the induced current), and this force is then transmitted to the conductor as a whole.