Exam 47: Magnetism and Electromagnetism

Which of these uses a movable core to act as an electric switch?

Magnetic lines of flux flow very easily through objects with high reluctance.

Where is the force of magnetic lines strongest in a bar magnet?

Which term describes current flow produced in a complete circuit when a magnetic field is moved back and forth across the circuit path?

Technician A says that magnets are used in some crankshaft position sensors. Technician B says magnets are used in potentiometers. Which technician is correct?

Technician A says that objects with high permeability allow magnetic lines of flux to flow easily through their material. Technician B says that some objects are good insulators that will not allow magnetic lines of flux to flow through their material. Which technician is correct?

How can the electromagnetic strength of an energized coil of wire be increased?

When discussing induced voltage caused by a magnetic field moving across a complete circuit, technician A says that the direction of current flow depends on the direction of movement of flux lines. Technician B says that the direction of current flow is called polarity. Which technician is correct?

Technician A says that magnetism can cause electric current to flow in a conductor. Technician B says that magnetic lines of flux can never penetrate rubber insulation on a conductor. Who is right?

A magnetic field can be measured using a ________.