All Flashcards
Label the following diagram of an Amperian loop around a wire.
1: Current-carrying wire, 2: Amperian loop, 3: Magnetic field direction, 4: Radius (r)
What are the differences between Ampère's Law and the Biot-Savart Law?
Ampère's Law: Easier for symmetric situations, uses closed loops. | Biot-Savart Law: More general, but often more complex to calculate, uses integration over current elements.
Compare and contrast electric and magnetic fields.
Electric Fields: Created by electric charges, exert force on charges, can be shielded. | Magnetic Fields: Created by moving charges/currents, exert force on moving charges, cannot be easily shielded.
What are the differences between Original Ampere's Law and Ampere-Maxwell Law?
Original Ampere's Law: Magnetic fields are created by electric currents. | Ampere-Maxwell Law: Magnetic fields are created by electric currents and changing electric fields.
What is the effect of increasing the current in a wire?
Increases the magnetic field strength around the wire.
What is the effect of increasing the number of turns per unit length in a solenoid?
Increases the magnetic field strength inside the solenoid.
What happens when a changing electric field occurs?
Creates a magnetic field (Maxwell's addition to Ampère's Law).
What is the effect of increasing the distance from a current-carrying wire?
Decreases the magnetic field strength.
What happens when a changing magnetic field occurs?
Creates an electric field (Faraday's Law).