Ferromagnetic materials have pre-existing magnetic fields.

More Questions from Magnetism and Electromagnetism

• The induced voltage across a stationary conductor in a stationary magnetic field ___.
• After the magnetizing force has been removed, the ratio of the remaining magnetic flux to the saturated magnetic flux is called _____________.
• The movable part in a relay is the _____.
• A group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___.
• The ___ is an electromagnetic device that contains a coil rotating on a jeweled bearing mount.
• When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage will _____.
• ___ is the ability of a material to remain magnetized after removal of the magnetizing force.
• When the current through a coil reverses direction, the magnetic field around the coil _____.
• You can determine the direction of the lines of force surrounding a conductor by using _____.
• The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10–3 m2.

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