Untitled Deck Flashcards
What is Faraday’s Law of Electromagnetic Induction?
It states that the induced e.m.f. in a circuit is directly proportional to the rate of change of magnetic flux linkage.
What is Lenz’s Law?
Lenz’s Law states that the direction of the induced e.m.f. opposes the change in magnetic field that caused it.
How does the speed of a conductor moving through a magnetic field affect the induced e.m.f.?
A faster speed increases the rate of magnetic flux change, leading to a higher induced e.m.f.
How does the frequency of the coil rotation in an a.c. generator affect the output?
Increasing the rotation frequency increases the frequency of the output a.c. signal, producing more rapid cycles.
What effect does increasing the strength of the magnetic field in an a.c. generator have?
A stronger magnetic field increases the magnitude of the e.m.f. produced in each cycle.
What is the purpose of a transformer, and how does it relate to electromagnetic induction?
Transformers use electromagnetic induction to change voltage levels in a circuit, either stepping up or stepping down the voltage depending on the application.
What happens to the magnetic field around a solenoid if the number of coils increases?
The magnetic field strength inside the solenoid increases, producing a stronger electromagnet.
Why does inserting an iron core inside a solenoid increase its magnetic field?
The iron core becomes magnetized, enhancing the overall magnetic field strength due to its ferromagnetic properties.
What practical applications use the magnetic effect of current?
Applications include electric motors, electromagnets, and relays used in various electronic devices and machinery.
What is the formula to calculate the force on a current-carrying conductor in a magnetic field?
F=BIL, where F is force, B is magnetic flux density, I is current, and L is the length of the conductor in the magnetic field.
How does reversing the current or magnetic field direction affect the force direction on a conductor?
Reversing either the current or field direction reverses the force direction, as shown by the left-hand rule.
What applications rely on the force on a current-carrying conductor?
Electric motors and loudspeakers use this principle, converting electrical energy into mechanical movement or sound.
