Pre-Class 8

A  west

B  downward

C  upward

D  east

E  north

F  south

A  An electric charge moving parallel to the magnetic field experiences a magnetic force. The direction of the magnetic force acting on a moving charge in the magnetic field is perpendicular to the direction of the magnetic field. The magnetic force is exerted on a stationary electric charge in the uniform magnetic field.

B  An electric charge moving parallel to the magnetic field experiences a magnetic force. The magnetic force is exerted on a stationary electric charge in the uniform magnetic field.

C  An electric charge moving parallel to the magnetic field experiences a magnetic force. The magnetic force is exerted on a stationary electric charge in the uniform magnetic field. An electric charge moving perpendicular to the magnetic field experiences a magnetic force.

D  An electric charge moving perpendicular to the magnetic field experiences a magnetic force. The direction of the magnetic force acting on a moving electric charge in the magnetic field is perpendicular to the direction of motion. The direction of the magnetic force acting on a moving charge in the magnetic field is perpendicular to the direction of the magnetic field.

A  Unlike electric field lines, magnetic field lines are continuous. Magnetic field lines can never intersect. At every point in space, the magnetic field vector at that point is tangent to the magnetic field line through that point.

B  Magnetic field lines point in the direction of the magnetic force acting on a charge. Unlike electric field lines, magnetic field lines are continuous.

C  Magnetic field lines point in the direction of the magnetic force acting on a charge. Magnetic field lines are close together in regions of space where the magnitude of the magnetic field is weak, and they are father apart in regions where it is strong. Magnetic field lines can never intersect.

D  Magnetic field lines point in the direction of the magnetic force acting on a charge. Magnetic field lines are close together in regions of space where the magnitude of the magnetic field is weak, and they are father apart in regions where it is strong.

A  A permanent magnet creates a magnetic field at all points in the surrounding region. An electric current in a conductor creates a magnetic field at all points in the surrounding region. A moving electric charge creates a magnetic field at all points in the surrounding region.

B  A distribution of electric charges at rest creates a magnetic field at all points in the surrounding region. A single stationary electric charge creates a magnetic field at all points in the surrounding region. A permanent magnet creates a magnetic field at all points in the surrounding region.

C  A distribution of electric charges at rest creates a magnetic field at all points in the surrounding region. A single stationary electric charge creates a magnetic field at all points in the surrounding region.

D  An electric current in a conductor creates a magnetic field at all points in the surrounding region. A single stationary electric charge creates a magnetic field at all points in the surrounding region.

A  Scientists have evidence that single isolated magnetic poles, called magnetic monopoles, exist. Earth’s geographic south pole is also a magnetic south pole.

B  Earth’s geographic south pole is also a magnetic south pole. The north poles of two bar magnets will attract each other. Scientists have evidence that single isolated magnetic poles, called magnetic monopoles, exist.

C  The north pole of a bar magnet will attract the south pole of another bar magnet. The south poles of two bar magnets will repel each other.Earth’s geographic north pole is actually a magnetic south pole.

D  Earth’s geographic south pole is also a magnetic south pole. The north poles of two bar magnets will attract each other.