Week 12 Physics Review (last one KC 6)
The magnitude of the magnetic force on a charge depends on - the velocity component perpendicular to the magnetic field. - the magnitude of the charge. - the sign of the charge.
Three of the items are correct.
The north pole of a magnet points towards Earth's geographic north pole. (T/F)
True
Surrounding every magnet is -both of these -neither of these - a magnetic field - an electric field.
a magnetic field.
Magnetic fields are produced by - a tiny fraction of moving electrical charges. - most moving electrical charges. - all moving electrical charges.
all moving electrical charges.
In general, a common magnet has
at least two poles.
The direction of the force exerted on a moving charge in a magnetic field is
at right angles to the direction of the motion.
A current-carrying wire in a magnetic field - may be deflected - neither of these - may experience a force - both of these.
both of these
A current-carrying wire in a magnetic field - may experience a force - may be deflected
both of these
An electron beam directed through a magnetic field - may be deflected. - may experience a force.
both of these
Whereas electric charges can be isolated, magnetic poles
cannot.
Magnetic field lines about a current-carrying wire
circle the wire in closed loops.
A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current
circles the wire in a counter-clockwise direction.
Magnetic field strength about a magnet is strongest where magnetic field lines are
closer together.
A bar magnet has a north pole and a south pole. This arrangement is referred to as a
dipole
A negative ion is moving east near the equator where the Earth's magnetic field is horizontal to the north. The direction of the magnetic force on the ion is
down.
We observe that a moving charged particle experiences no magnetic force. From this we can definitely conclude that
either no magnetic field exists or the particle is moving parallel to the field.
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
exactly 100 N.
Which of the following magnetic materials has domains?
ferromagnetic
A proton and electron, each travelling at the same speed, enter a region of uniform magnetic field. They experience
forces equal in magnitude, but opposite in direction
A straight wire is carrying a current upward. Observed from above (i.e., looking downward toward the wire), the magnetic field lines are
forming counter-clockwise circles.
The magnetic field lines inside a bar magnet go in what direction?
from south pole to north pole
If you break a bar magnet in half you'll
have two magnets
A wire is carrying current vertically downward. What is the direction of the force on this wire due to Earth's magnetic field?
horizontally towards the east
A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be strongest when the particle moves
in a plane parallel to Earth's surface.
When a ferromagnetic material is placed in an external magnetic field, the net magnetic field of its magnetic domains becomes - zero - larger -smaller
larger
A charged particle that is moving in a static uniform magnetic field
may experience a magnetic force, but its speed will not change.
The magnetic force on a point charge in a given magnetic field and at a given speed is largest when it
moves perpendicular to the magnetic field.
All materials are magnetic and are described by one of these three properties. Select the property that is invalid. - ferromagnetic - paramagnetic - nonmagnetic - diamagnetic
nonmagnetic
The end of a compass needle that points to the south pole of a magnet is the
north pole
The conventional direction of magnetic field lines outside a magnet are from - south to north. - north to south.
north to south.
A beam of electrons can pass through a magnetic field without being deflected if the direction of the beam is
parallel to the field lines.
A beam of electrons passing through a magnetic field experiences maximum deflection if the direction of the beam is
perpendicular to the field lines.
The force exerted on an electron moving in a magnetic field is maximum when the electron moves
perpendicular to the magnetic field.
The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is
repulsive and equal in magnitude.
A vertical wire carries a current vertically downward. To the east of this wire, the magnetic field points
south
The magnetic force on a current-carrying wire in a magnetic field is the strongest when
the current is perpendicular to the magnetic field lines.
The force on an electron moving in a magnetic field will be least when its direction is
the same as the magnetic field direction.
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,
the wires pull toward each other.
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,
the wires push away from each other.
A proton has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component
to the east.
An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component
to the west.
A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must have a component
toward the east.
At a particular instant, a proton moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
toward the north
An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the magnetic field must have a component
toward the north.
A proton, moving east, enters a magnetic field. Because of this magnetic field the proton curves downward. We may conclude that the magnetic field must have a component
toward the south.
A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves upward. We may conclude that the magnetic field must have a component
toward the south.
At a particular instant, an electron moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
toward the south.
A vertical wire carries a current straight up in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this wire?
toward the west
An electron, moving south, enters a magnetic field. Because of this field, the electron curves upward. We may conclude that the magnetic field must have a component
toward the west
A 3.0-cm section of a horizontal wire carrying a 6.7-A current from east to west is placed in a north to south 0.42-T magnetic field in the lab. In what direction is the magnetic force on the 3.0-cm section?
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