Magnets and Magnetic Fields Quiz

Which of the following situations is not true for magnets?

• Like poles repel each other.

• Unlike poles repel each other.

• North poles repel each other.

• A north pole and a south pole will attract each other.

Where is the magnitude of the magnetic field around a permanent magnet greatest?

• The magnitude is greatest close to the poles.

• The magnitude is greatest far from the poles.

• The magnitude is equal at all points on the field.

• The magnitude is greatest halfway between poles.

All of the following statements about magnetic field lines around a permanent magnet are true except which one?

• Magnetic field lines appear to end at the north pole of a magnet.

• Magnetic field lines have no beginning or end.

• Magnetic field lines always form a closed loop.

• In a permanent magnet, the field lines actually continue within the magnet itself.

A microscopic magnetic region composed of a group of atoms whose magnetic fields are aligned in a common direction is called a(n) ________. In most materials, when these groups are randomly distributed, the substance will show ________ magnetism.

• Domain; no

• Pole; some

• Cell; unusual

• Ion; strong

In a magnetized substance, the domains:

• Are randomly oriented.

• Cancel each other.

• Line up mainly in one direction.

• Can never be reoriented.

In a permanent magnet,

• domain alignment persists after the external magnetic field is removed.

• domain alignment becomes random after the external magnetic field is removed.

• domains are always randomly oriented.

• the magnetic fields of the domains cancel each other.

In soft magnetic materials such as iron, what happens when an external magnetic field is removed?

• The domain alignment persists.

• The orientation of domains fluctuates.

• The material becomes a hard magnetic material.

• The material returns to an unmagnetized state.

Which statement describes Earth’s magnetic declination?

• The angle between Earth’s magnetic field and Earth’s surface

• Earth’s magnetic field strength at the equator

• The tendency for Earth’s field to reverse itself

• The angle between true north and north indicated by a compass

Which of the following statements about Earth’s magnetic field is true?

• The geographic North Pole of Earth and Earth’s magnetic north pole are at the same location.

• The geographic South Pole of Earth and Earth’s magnetic north pole are relatively close to each other.

• The north needle of a compass always points to the geographic North Pole of Earth.

• The north needle of a compass points to Earth’s magnetic north pole.

Which of the following statements about magnets is true?

• Magnets attract plastic objects.

• Magnets attract iron-containing objects.

• Magnets attract wooden objects.

• Magnets attract glass objects.