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What consists of a coil with an iron core and a movable iron bar?
A coil with an iron core and a movable iron bar constitutes an electromagnet. When an electric current flows through the coil, it generates a magnetic field that attracts the iron bar, causing it to move. This device is commonly used in various applications such as in electric motors and doorbells.
What is the purpose of the coil in a speaker?
The coil in a speaker, often called the voice coil, is used to convert electrical signals into mechanical vibrations (sound). When an electrical current passes through the coil, it interacts with the magnetic field of the speaker, causing the coil to move back and forth rapidly, which in turn creates sound waves.
How does a current in the coil make the straw pointer move?
1.Current in the coil produces a magnetic fieldalso accept "the coil becomes an electromagnet"or "the coil is magnetized"2.The magnet is repelled or attractedalso accept "the field or coil exerts a force on themagnet"
How does a loudspeaker work in terms of the motor effect?
The loudspeaker, as in the dynamo and electric motor, uses the priciple of electrical induction in a conductor through movement inside a magnetic field. The sound information (from any source) is conveted to constantly varying electrical signals, these are amplified and fed to a coil at the speaker. In simple terms, the current in the coil produces a magnetic field which varies as the sound varies and this then forces a soft iron rod, which is connected to the speaker baffle (large sheet of cardboard that produces the sound waves) to move in and out, so causing waves in the air around it, which is sound.
What transfers electrical energy to sound energy?
A speaker is a device that transforms electrical signals into sound waves. The electrical current passing through the speaker's voice coil interacts with a magnetic field, causing the coil to move back and forth. This movement creates vibrations in the speaker cone, which in turn produces sound waves that travel through the air.
Why electricity pass through iron?
Electricity can pass through iron because iron is a good conductor of electricity. When a voltage is applied across iron, the electrons in the iron are easily able to move and carry the electric current along. This is due to the metallic bonding in iron, which allows electrons to move freely.
A spinning coil of wire is what moves the cone in a speaker?
When an electric current is passed through the coil of wire in a speaker, it creates a magnetic field that interacts with a permanent magnet. This interaction causes the coil to move back and forth, which in turn moves the cone of the speaker and produces sound waves.
How does a coil affect a motor?
..because of coil it creates magnetic field through the magnet, the coil contains electric charges and it continue to move, upward and downward. The significant of coil is to store electric charges.
What happens to the amplitude of the longitudinal waves as the waves move from the large coil slinky to the small coil slinky?
The amplitude of longitudinal waves decreases as they move from the large coil slinky to the small coil slinky due to energy loss caused by friction and absorption. This results in a reduction in the intensity of the waves as they propagate through the smaller coil slinky.
What are the three ways in which voltage can be induces in a wire?
Voltage can never be induced in a straight open wire because flux through a wire is zero but a coil made up of a wire can have induced voltage. Methods Move a magnet to and fro through the coil, the magnitude can be changed by altering the relative velocities between them Move the coil relative to he still magnet Place the coil in a time varying magnetic field such that the flux linked through the coil changes with respect to time Place the coil tn an uniform magnetic field and alter its area with respect to time
Describe how a simple generator produces electric energy?
A copper wire coil is rotated at speed in a magnetic field, to cause electrons to move. This is the electric current. The stronger the magnets and/or thicker the copper coil, the more current is produced
How can iron filings be separated from the soil sample?
Iron is magnetic so move a magnet through your soil sample to remove all the iron fillings.
