A current is induced in a wire by moving the wire through a magnetic field. Which is one factor that affects the direction of the current?
the direction in which the wire moves
the thickness of the wire
the direction of the needle on an ammeter
the type of magnet
The direction in which the wire moves is one factor that affects the direction of the current induced in the wire.
The diagram shows a setup for inducing a current in a wire.
A wire connected to the red and blue terminals on a grey box, which contains a white box with a needle pointing to the right with the number 0 above the center of the white box. The wire passes through a 3 sided trough with a bar magnet running on each side of the top inside of the trough. There the wire is labeled with an upward pointing arrow and the words Direction of movement of wire.
Which change would cause the needle on the ammeter to point to the left of the zero?
making the wire thicker
adding coils to the wire
disconnecting the wire from one end of the ammeter
moving the wire downward through the magnetic field
Moving the wire downward through the magnetic field would cause the needle on the ammeter to point to the left of the zero.
Assuming a current is flowing, what increases the strength of the magnetic field of a coiled electrical wire?
straightening the wire
changing the direction of the current flow
adding more coils to the wire
stopping the current
Adding more coils to the wire increases the strength of the magnetic field generated by a coiled electrical wire.
Dante drew a diagram to show how a wire uses the magnetic field of a magnet to induce an electric current.
A wire connected to the red terminal on a grey box, which contains a white box with a needle pointing up. The wire is disconnected from the blue terminal on this box. The wire passes through a 3 sided trough with a bar magnet running on each side of the top inside of the trough. There the wire is labeled with a downward pointing arrow and the words Direction of movement of wire.
How can Dante correct the diagram?
He can move the wire upward instead of downward.
He can connect the wire to both ends of the ammeter.
He can change the wire from coiled to straight.
He can place the wire between the poles of the magnet and not move it.
Dante can correct the diagram by connecting the wire to both ends of the ammeter. This ensures that the electric current induced in the wire can be measured accurately.
Juan makes an adjustment to an electromagnet that causes the electromagnet to lose some of its strength. What did Juan most likely do?
He reduced the number of loops in the wire.
He increased the number of loops in the wire.
He reduced the length of the wire.
He increased the length of the wire.
Juan most likely reduced the number of loops in the wire.
Which wire, when current flows through it, would be surrounded by the strongest magnetic field?
A thin copper colored bar.
A copper colored coil with 2 turns.
A copper colored coil with 5 turns.
A thick copper colored bar.
The copper colored coil with 5 turns would be surrounded by the strongest magnetic field when current flows through it. Increasing the number of turns in the coil increases the strength of the magnetic field produced.
A compass needle normally points toward Earth’s magnetic pole, which is near the North Pole. Which best explains why the needle moves away from the pole when it comes close to a current-carrying wire?
Current within the wire weakens the magnetic force of the pole.
Magnetism surrounding the wire weakens the magnetic force of the pole.
Current within the wire draws the needle toward the wire.
Magnetism surrounding the wire draws the needle toward the wire.
Magnetism surrounding the wire weakens the magnetic force of the pole, which best explains why the compass needle moves away from the pole when it comes close to a current-carrying wire.
If the current in each wire is the same, which wire produces the strongest magnetic field?
a wire that is 1 mm thick and not coiled
a wire that is 2 mm thick and not coiled
a 1-mm-thick coiled wire with ten loops
a 2-mm-thick coiled wire with two loops
The 2-mm-thick coiled wire with two loops would produce the strongest magnetic field if the current in each wire is the same. Increasing the thickness of the wire and the number of loops in the coil both contribute to a stronger magnetic field.
When a conductor is passed through a magnetic field, a current is induced in the ______.
area above the conductor.
magnetic field.
area above the magnetic field.
conductor.
When a conductor is passed through a magnetic field, a current is induced in the conductor itself.
How does adding an iron bar to a solenoid affect the magnetic field of the electromagnet?
It changes the magnetic field to a current.
It changes the magnetic field’s direction.
It increases the magnetic field’s strength.
It decreases the magnetic field’s strength.