Table of Contents
- 1 How do you evaluate the electromotive force induced by the motion of conductor across the magnetic field?
- 2 When the current through a solenoid increases at a constant rate?
- 3 What effect describes an induced voltage across a conductor in a magnetic field perpendicular to the current?
- 4 What four factors affect the magnitude of the induced emf?
- 5 What is a solenoid and how does it work?
How do you evaluate the electromotive force induced by the motion of conductor across the magnetic field?
An emf induced by the motion of the conductor across the magnetic field is a motional electromotive force. The equation is given by E = -vLB. This equation is true as long as the velocity, field, and length are mutually perpendicular. The minus sign associated with the Lenz’s law.
How can an emf be induced in a loop?
There are therefore three ways an emf can be induced in a loop:
- Change the magnetic field.
- Change the area of the loop.
- Change the angle between the field and the loop.
What factors that affects the magnitude of the induced emf and the magnitude and direction of the induced current based your answer in Faraday’s Law?
The number of turns of the coil:As the number of turns increases, the magnitude of the induced current increases.
When the current through a solenoid increases at a constant rate?
When the current through a solenoid increases at a constant rate, the induced current in the solenoid. Is a constant and is opposite to the direction of the increasing current in it.
What is the cause of induced emf?
The most basic cause of an induced EMF is change in magnetic flux. Placing a current carrying coil that is moving constantly in a stable and static magnetic field. This will cause a change in the area vector and hence, EMF will be generated.
Does induced emf oppose current?
The induced emf produces a current that opposes the change in flux, because a change in flux means a change in energy.
What effect describes an induced voltage across a conductor in a magnetic field perpendicular to the current?
The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor that is transverse to an electric current in the conductor and to an applied magnetic field perpendicular to the current. It was discovered by Edwin Hall in 1879.
Does radius affect emf?
Significance If the area of the loop were changing in time, we would not be able to pull it out of the time derivative. Since the loop is a closed path, the result of this current would be a small amount of heating of the wires until the magnetic field stops changing.
How does the number of loops affect the magnitude of the induced emf?
The induced current depends on both the area of the coil and the change in magnetic field. In a coil of wires, each loop contributes an area A to the right-hand side of the equation, so the induced emf will be proportional to the number of loops in a coil.
What four factors affect the magnitude of the induced emf?
The area of the coil, how long it takes for changes to occur, how many turns of wire in coil, or the magnetic field part that’s perpendicular to the plane of the coil could affect the magnitude of induced emf in a wire coil.
What is the magnetic field of an infinite length solenoid?
The magnetic field B is proportional to the current I in the coil. The expression is an idealization to an infinite length solenoid, but provides a good approximation to the field of a long solenoid.
Why does the current flow in opposite directions outside the solenoid?
Along segment 3, because the magnetic field is zero outside the solenoid. If you consider an Ampère’s law loop outside of the solenoid, the current flows in opposite directions on different segments of wire.
What is a solenoid and how does it work?
A solenoid is a long coil of wire wrapped in many turns. When a current passes through it, it creates a nearly uniform magnetic field inside. Solenoids can convert electric current to mechanical action, and so are very commonly used as switches.
Why do we use ampere’s law for solenoids?
The expression is an idealization to an infinite length solenoid, but provides a good approximation to the field of a long solenoid. This admittedly idealized case for Ampere’s Law gives. This turns out to be a good approximation for the solenoid field, particularly in the case of an iron core solenoid.
https://www.youtube.com/watch?v=2lLbSzcBUTw