Electric Charges
What is a positive charge?
This type of charge attracts a negative charge.
What is positive?
Lines of electric field point away from this charge type.
What is the ampere?
The unit of electric current.
What is attract?
Opposite magnetic poles do this.
What is a magnetic field?
An electric current in a wire creates this around the wire.
What is repel?
Like charges do this.
What is electric field?
This quantity is the force per unit charge.
What is series?
A circuit where components share the same current is wired in this configuration.
What are north and south?
All magnets have these two poles.
What is an electromagnet?
A coil of wire that acts like a magnet when current flows.
What is the coulomb?
The unit of electric charge.
What is E?
The symbol used for electric field.
What is current?
According to Ohm’s Law, V = this × resistance.
What is the north pole?
Magnetic field lines emerge from this pole
What is increase?
Increasing the number of loops in a coil does this to the magnetic field strength.
What is friction (triboelectric charging)
Charging by rubbing two objects together is called this.
What is the direction of the field?
The direction of electric force on a positive test charge placed in a field
What is decrease?
Adding more resistors in parallel does this to the total resistance.
What is ferromagnetic material (iron, cobalt, nickel)?
This material can be permanently magnetized.
What is Faraday’s Law?
A changing magnetic field induces an electric current—this law.
What is Coulomb’s Law?
This law states that the force between two charges varies with the product of the charges and inversely with the square of distance.
What is 16×?
Two charges are doubled and distance is halved.
What is a fuse?
This device protects circuits by melting when current is too high.
What is at the poles?
The region where magnetic field is strongest in a bar magnet.
What is the Lorentz force?
Electric motors rely on this force on a current-carrying wire in a magnetic field.