A coil of wire containing N turns is in an external magnetic field that is perpendicular to the plane of the coil and it steadily changing. Under these circumstances, an emf is induced in the coil.
If the rate of change of the magnetic field and the number of turns in the coil are now doubled (but nothing else changes), what will be the induced emf in the coil? A) 2
B) /2
C) 4
D) /4
E)
Question 2
When a ferromagnetic material is placed in an external magnetic field, the net magnetic field of its magnetic domains becomes
A) smaller.
B) zero.
C) larger.
The visual field as seen by a person with (a) glaucoma, (b) macular degeneration, and (c) cataracts.
Field Spaniel
Olenoides erratus from the Mt. Stephen Trilobite Beds (Middle Cambrian) near Field, British Columbia
The primary windings are inside the secondary windings on this General Motors coil.
Structures of the external eye
A test field of GM papaya