Magnetism
Magnetic Fields
Electromagnetic Force
Electricity, Magnetism, and Motion
Electricity from Magnetism
100
Every magnet, regardless of its shape, has two magnetic ___.
What are poles?
100
Lines that spread out from one pole and curve around to the other.
What are magnetic field lines?
100
You can increase the strength of an electromagnet's field by ___.
What is using a stronger ferromagnetic material for the core? (also: increase the current in the solenoid)
100
It can be turned on and off. Its direction can be reversed. It strength can be changed.
What are characteristics of a magnetic field?
100
The type of current produced by a battery.
What is direct current?
200
The force of attraction or repulsion of magnetic materials.
What is magnetism?
200
As Earth's magnetic poles move, the magnetic declination in a given location will change / not change.
What is change?
200
An electric current produces a(n) ___ ___.
What is magnetic field?
200
When a wire with a current is placed in a magnetic field, electrical energy is transformed into ___ ___.
What is mechanical energy?
200
Electric current from a generating plant is ___ current transmitted at high voltages, but usually used at ___ voltages.
What is alternating current, used at low voltages?
300
Two south magnetic poles brought near each other do this.
What is repel each other?
300
A ___ is a device that has a magnetized needle that can spin freely.
What is a compass?
300
To measure the current induced by moving a wire through a magnetic field, you would need a piece of equipment scientist use called a ___.
What is galvanometer?
300
A major difference between a galvanometer and a motor.
What is in an electric motor, the armature spins continuously?
300
A generator transforms ___ energy into ___ energy.
What is mechanical energy into electrical energy?
400
A north magnetic pole brought near a south magnetic pole:
What is attracts the south pole.
400
___ is the angle between geographic north and the north to which a compass needle points.
What is Declination?
400
A common electrical device is shown in the diagram.
What is an electric motor?
400
To reverse the direction of current in a motor, current is conducted through the __ to the ___.
What is brushes to the commutator?
400
The direction the wire move in this picture if the direction of the current were reversed.
What is upward?
500
Any material that exerts magnetic force is considered a(n) ___.
What is a magnet?
500
You can increase a step-up transformer's voltage with:
What is increasing the number of loops in the secondary coil?
500
___ will produce the strongest magnetic field.
What is B (because of the number of coils and the nail in the middle of the coils - both add strength)?
500
According to diagram A, the direction the upper loop of the wire will move is ___.
What is downward?
500
Look at the circular arrow in the diagram. The side of the loop is moving up is the side closest to the ___ magnetic pole.
What is the south magnetic pole?