Quiz6_Ch24

Solar winds headed in Earth's direction are deviated mainly by the troposphere. Earth's radiation belts. the upper atmosphere. Earth's magnetic field.

Earth's magnetic field.

A galvanometer indicates magnetic field strength. electric voltage. electric charge. a flow of electrons.

a flow of electrons.

An aurora borealis high above the atmosphere is due to all of the above disturbances in Earth's magnetic field. fountains of high-speed charged particles. trapping of charged particles by Earth's magnetic field.

all of the above

Like kinds of magnetic poles repel while unlike kinds of magnetic poles repel also. may attract or repel. attract.

attract.

When a current-carrying wire is bent into a loop, its magnetic field inside the loop weakens. becomes concentrated. none of the above cancels.

becomes concentrated.

Although a magnet can change the direction of travel of an electron beam, it cannot change its speed neither of these both of these kinetic energy.

both of these

No net force acts on a loop of wire in a magnetic field when no current is in the loop. neither of these both of these no magnetic field lines pass through the loop.

both of these

The force that acts between a pair of electrically-charged particles depends on separation distance. neither of these both of these magnitude of charge.

both of these

Which force field can accelerate an electron? electric field neither of these magnetic field both of these

both of these

In the atoms of most materials the fields of individual electrons cancel one another. completely align. partly align

cancel one another.

Magnetic field strength about a magnet is strongest where magnetic field lines are closer together. straightest. more spread. most curved.

closer together.

Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is equally huge. relatively small. inversely proportional to their masses.

equally huge.

Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is at or about 50 N. exactly 100 N. need more information

exactly 100 N.

Over geologic history the Earth's magnetic field has reversed direction many times. has increased in strength exponentially. is unknown. has been relatively stable

has reversed direction many times.

Place an iron rod inside a current-carrying coil of wire and you have a superconducting magnet. a magplane in the making. increase the strength of the electromagnet

increase the strength of the electromagnet

Pigeons navigate primarily by a keen sense of smell. none of the above a good memory. ultra-high-pitched sounds. magnetic sensors in their heads.

magnetic sensors in their heads.

The source of all magnetism is tiny domains of aligned atoms. moving electric charge. none of the above ferromagnetic materials. tiny pieces of iron

moving electric charge.

The conventional direction of magnetic field lines outside a magnet are from north to south. either way south to north

north to south.

If a magnet produces a force on a current-carrying wire, the wire produces a force on the magnet. may or may not produce a force on the magnet. none of these

produces a force on the magnet.

Refrigerator magnets are typically long range. none of these short range.

short range.