Post- test April 16

It is a fundamental law in electromagnetism that describes the relationship between a magnetic field and the current that creates it.

• Magnetic fields

• Biot Savart Law

• Ampere's Law

Ampere's law states that B = μ₀I / 2πr. The name of the constant, μ_0, is

• Ampere's number

• Ampere's constant

• the permeability of closed space

• the permeability of free space

___ Law defines the magnetic field generated by a long straight wire

• Lenz'
• Faraday's
• Ampere's

Ampere's law states that B = μ₀I / 2πr. This is useful in practice because

• people want to see wires move

• it allows people to calculate a magnetic field as long as they know how much current there is and the radius of a conductor

• it allows people to calculate a magnetic field as long as they know how much current there is and the length of a wire

• it allows people to calculate the amount of current passing through as long as they know the magnetic field strength and the radius of a conductor

If you wrap more coils around an electromagnet, its magnetic strength will become...

• brighter

• stronger

• weaker

• invisible

What is the principle of an electromagnet?

• Magnetic field is produced by an electric current

• Magnetic field is produced by magnetism

• Magnetic field is produced by relactance

Ampere's Law is

• Equation 1

• Equation 2

• Equation 3

• Equation 4

In a simple electrical connection, one of the lines of the source is connected to ____

• Terminal 1 of the load

• Terminal 2 of the load

• Terminal 1 of the switch

• Terminal 1 and 2 of the switch

The force that opposes and reduces the flow of electrical current is organized as ___

• Power

• Electromagnetism

• Resistance

• Frequency

A part of an electric circuit which converts electrical energy into another form of energy to do work is _____

• Load

• Circuit

• Source

• Control