magnetism

Magnetic poles come in which two varieties?

• Positive and negative poles

• North and east poles

• North and south poles

• Repulsive and attractive poles

According to the law of magnetic attraction, like poles:

• Attract each other

• Repel each other

• Have no effect on each other

• Create an electric field

The discoveries of Oersted and others regarding magnetism and currents led to the development of:

• Steam engines

• Modern electronic devices

• Internal combustion engines

• Black powder weapons

What determines the force experienced by a moving charge in a magnetic field?

• The mass of the charge

• The direction of the magnetic field only

• The velocity of the charge and the magnetic field

• The type of charge (positive or negative) only

The right-hand rule 1 (RHR-1) is used to determine the direction of the magnetic force on a moving:

• Neutral object

• Positive charge

• Current-carrying wire

• Negative charge and a positive charge needs a different rule

Magnetic field lines are used to represent what about a magnetic field?

• The flow of electric current

• The location of charged particles

• The direction and strength of the field

• The path of a compass needle

Why is it impossible to isolate a single magnetic pole (north or south)?

• Magnetic poles lose strength over time

• Magnetic poles only exist in pairs (north and south)

• The Earth's magnetic field interferes with isolation

• There's no force between isolated magnetic poles

A charged particle moving in a perpendicular magnetic field experiences a force that causes it to move in a:

• Straight line

• Circular path

• Random zig-zag pattern

• Square path

What does the period of circular motion for a charged particle depend on?

• The mass of the particle and the magnetic field strength

• The charge of the particle and the current in the field

• The velocity of the particle and the angle of the field

• The distance between the particle and the field source

The magnetic force on a current-carrying conductor is directly proportional to:

• The length of the conductor only

• The current flowing through the conductor only

• The angle between the conductor and the magnetic field

• Both the current and the length of the conductor**