Admin Table of Contents
- 1 When all the electrons in a material spin in the same direction what is it?
- 2 Which part of a circuit can be turned on and off to make an electromagnet work or stop?
- 3 Do electrons have a north and south pole?
- 4 What is the direction of the current induced in the coil?
- 5 How does the number of turns in a coiled wire affect the induced emf in the set up?
When all the electrons in a material spin in the same direction what is it?
In substances such as iron, cobalt, and nickel, most of the electrons spin in the same direction. This makes the atoms in these substances strongly magnetic—but they are not yet magnets. To become magnetized, another strongly magnetic substance must enter the magnetic field of an existing magnet.
What would happen if you rotated a loop of wire in between two ends of a permanent magnet?
They also found that moving a magnet through a loop of wire produces a current. The magnet and wire loop must be moving relative to each other for an electric current to be produced. This causes the magnetic field inside the loop to change with time.
Which part of a circuit can be turned on and off to make an electromagnet work or stop?
The movement of electrons causes both, and every electric current has its own magnetic field. This magnetic force in electricity can be used to make powerful electromagnets that can be turned on and off with the flick of a switch.
What is the common name for the coil of wire that spins in the magnetic field?
electromagnet
An electromagnet is a coil of wire wrapped around a bar of iron or other ferromagnetic material. When electric current flows through the wire, it causes the coil and iron bar to become magnetized. An electromagnet has north and south magnetic poles and a magnetic field.
Do electrons have a north and south pole?
Electrons are teeny tiny magnets. They have a north and a south pole, too, and spin around an axis. Every electron has one of two possible orientations for its axis. In most materials, atoms are arranged in such a way that the magnetic orientation of one electron cancels out the orientation of another.
In what direction does the induced current flow in the loop?
counterclockwise
The induced current will be counterclockwise (ccw). As the bar moves upward through the constant magnetic field region, the area of the loop decreases, so the flux through the loop decreases. By Lenz’s law, any induced current will tend to oppose the decrease.
What is the direction of the current induced in the coil?
The current induced in the coil creates another field, in the opposite direction of the bar magnet’s to oppose the increase. This is one aspect of Lenz’s law—induction opposes any change in flux.
What is the effect of tightness of the wire coiled around the nail?
The more loops the coil has, the stronger the magnetic field, while the current is flowing. But when you coil the wire around an iron nail, the magnetic domains inside the nail line up and make a strong, temporary magnet. If you disconnect the wire, the magnetic field disappears and the nail is no longer a magnet.
How does the number of turns in a coiled wire affect the induced emf in the set up?
Increasing the number of turns of wire in the coil – By increasing the amount of individual conductors cutting through the magnetic field, the amount of induced emf produced will be the sum of all the individual loops of the coil, so if there are 20 turns in the coil there will be 20 times more induced emf than in one …