chapter 24- physics

A galvanometer indicates

a flow of electrons

Magnetic fields are produced by

all moving electrical charges.

Biomagnetism has been detected in

all the above

To weaken a bar magnet

all the above

Although a magnet can change the direction of travel of an electron beam, it cannot change its

both

A current-carrying wire in a magnetic field

both of these

A galvanometer can be calibrated to measure

both of these

An electron beam directed through a magnetic field

both of these

No net force acts on a loop of wire in a magnetic field when

both of these

In the atoms of most materials the fields of individual electrons

cancel one another

Magnetic field strength about a magnet is strongest where magnetic field lines are

closer together

When an electron passes through the magnetic field of a horseshoe magnet, the electron's

direction is changed

An initially unmagnetized iron nail is placed near one of the poles of a magnet. An iron nail is more strongly attracted to the magnet if the nearest pole of the magnet to the nail is the

either of these

Which force field can increase a moving electron's speed?

electric field

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

Magnetic domains normally occur in

iron

Into which stable force field can a proton be placed at rest without being acted upon by a force?

magnetic field

Pigeons navigate primarily by

magnetic sensors in the head

A compass needle in a magnetic field

may experience a pair of torques

Magnetism is due to the motion of electrons as they

move around the nucleus, spin on their axes, BOTH

Several paper clips dangle from the north pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a

north pole

The conventional direction of magnetic field lines outside a magnet are from

north to south

If a magnet produces a force on a current-carrying wire, the wire

produces a force on the magnet

A beam of singly-charged ions entering a magnetic field with the same speed are swept into circular paths. The wider paths are those of

the heavier ions

The force on an electron moving in a magnetic field will be least when its direction is

the same as the magnetic field direction