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