Electricity from Magnetism
Lenz's Law
Vocabulary Review
200
This is the process of creating current in a circuit by changing magnetic field.
What is electromagnetic induction?
200
The direction of the Magnetic Flux
What is up?
200
Electromagnetic waves are generated by the changing of these two types of fields.
What are electric and magnetic fields?
300
These are the three ways current can be induced in a circuit.
What is 1) by moving it into or out of a magnetic field 2) by rotating it in the magnetic field 3) by changing the intensity or direction of the magnetic field?
300
Direction of the induced flux
What is right?
300
The transfer of energy associated with an electric and magnetic field.
What is electromagnetic radiation?
400
According to Faraday's Law, Changing the magnetic flux of a closed loop causes this.
What is emf or voltage?
400
Direction of Induced Current in the loop
What is Counterclockwise?
400
BAcosθ
What is magnetic flux
500
A single circular loop with a radius of 25cm is placed in a uniform external field with strength of 0.75T so that the plane of the coil is perpendicular to the field. The coil is pulled steadily out of the field in 0.25s. Find the average induced emf during this interval.
What is 0.59V?
500
Lenz's law states that the direction of the induced current in a coil is such that it...
What is Opposes the change in magnetic flux that produced it
500
An insulating material put inside a capacitor
What is a dielectric?
600
A coil contains 250 loops and has a radius of 25cm and is placed in a uniform external field with strength of 0.75T so that the plane of the coil is perpendicular to the field. The coil is pulled steadily out of the field in 0.25s. Find the average induced emf during this interval.
What is 150V?
600
A conducting ring encloses an area of 2.0 cm2 and is perpendicular to a magnetic field of strength 5.0 mT. The direction of the magnetic field is reversed in a time 4.0 s. What is the average emf induced in the ring?
A. 0
B. 0.25 μV
C. 0.40 μV
D. 0.50 μV
D 0.50 μV
600
States that the current is always opposed to the change producing it
What is Lenz's Law?