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Chapter 16. Act(10) Make a electromagnet

Chapter 16. Act(10) Make a electromagnet. An electromagnet is a type of magnet in which the magnetic field is induced by the flow of an electric current through a coil of wire. The strength of the electromagnet depends on the amount of electric current and the number of turns of the coil.

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Chapter 16. Act(10) Make a electromagnet

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  1. Chapter 16. Act(10) Make a electromagnet An electromagnet is a type of magnet in which the magnetic field is induced by the flow of an electric current through a coil of wire. • The strength of the electromagnet depends on the amount of electric current and the number of turns of the coil. • The higher the current and the more number of turns will make the electromagnet more powerful. • - The magnetic field disappears when the flow of electricity is stopped. www.edu-science.co.kr

  2. Diagram of circuit

  3. Permanent magnet and electromagnet The difference between permanent magnet and electromagnet www.edu-science.co.kr

  4. Solenoid The right hand grip rule is a physics principle applied to electric current passing through a solenoid, resulting in a magnetic field. When you wrap your right hand around the solenoid with your fingers in the direction of the conventional current, your thumb points in the direction of the magnetic north pole. Fig. A Fig. B www.edu-science.co.kr

  5. Electricitypassing through a straight wire: The thumb points in the direction of the conventional current (from positive to negative),The otherfingers point in the direction of the magnetic field from north to south

  6. _ _ _ --- --- S O S Chapter 17. Act(11) Make a motor When electric current passes through the coil (called "armature" of the motor), it becomes an electromagnet. When the red and black wires reach the stripped part of the coil, current flows, forming an electromagnet. Diagram of circuit www.edu-science.co.kr

  7. - Since magnet pole of the same type repels each other, the north of the electromagnet is repelled by the north of the magnet. - This gives the coil a push, and it spins to a position where the wires and the coil breaks off, and the current ceases to flow. - Inertia carries it around until the stripped portion makes contact again.

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