P7- Magnetism And Electromagnetism Flashcards
What is the property of a material that allows it to create a magnetic field?
Ferromagnetism
True or False: A magnetic field is produced by a moving electric charge.
True
What is the SI unit of magnetic field strength?
Tesla (T)
What is the direction of the magnetic field lines around a current-carrying wire?
Circular, following the right-hand grip rule
What is the relationship between the magnetic field strength and the current in a solenoid?
Directly proportional
What is the effect of increasing the number of turns in a coil on the magnetic field strength?
Increases the magnetic field strength
What is the process of producing a magnetic field using electricity called?
Electromagnetism
What is the component of an electric motor that converts electrical energy into mechanical energy?
Armature
What is the direction of the force experienced by a current-carrying wire in a magnetic field?
Perpendicular to both the wire and the magnetic field, following Fleming’s left-hand rule
What is the device used to measure electric current?
Ammeter
What is the device used to measure potential difference?
Voltmeter
What is the relationship between the magnetic field strength and the distance from a current-carrying wire?
Inverse proportional
What is the phenomenon where a changing magnetic field induces an electromotive force in a circuit?
Electromagnetic induction
What is the device used to convert mechanical energy into electrical energy?
Generator
What is the law that states that the induced electromotive force in a circuit is proportional to the rate of change of magnetic field flux?
Faraday’s law of electromagnetic induction
What type of transformer increases voltage and decreases current?
Step-up transformer
What type of transformer decreases voltage and increases current?
Step-down transformer
What is the device that uses electromagnetic induction to store energy?
Inductor
What is the material used to enhance the magnetic field in an electromagnet?
Soft iron core
What is the unit of electromotive force?
Volt (V)
What is the relationship between the number of coils in a transformer’s primary and secondary coils?
Inversely proportional
What is the term for a material that retains its magnetism after the magnetic field is removed?
Permanent magnet
What is the effect of increasing the current in a solenoid on the magnetic field strength?
Increases the magnetic field strength
What is the relationship between the magnetic field strength and the distance from a magnet?
Inverse square proportional
