Questions and Answers
You can increase the strength of an electromagnet by which of the following? (Select all that apply)
The north and south poles of a solenoid change with which factor?
You can increase the strength of an electromagnet by which method?
Both solenoids and electromagnets produce magnetic fields using which of the following?
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What are the four ways to increase the strength of an electromagnet?
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Who discovered that wherever there is electricity, there is magnetism?
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An electric ____________________ produces a magnetic field.
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There are __________ ways to change the strength of a magnetic field.
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You can increase the strength of a magnetic field by increasing the amount of ___________ in the wire.
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To change the direction of a magnetic field, you reverse the direction of the _____________________.
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________________________ are used in electric motors, earphones, and in junkyards to lift old cars and other heavy steel objects.
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An electric current in a wire produces a ______________________.
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All magnetism is caused by the movement of _________________.
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An electric circuit is a path through which ________________ ________________ can flow.
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An _______________________ is a strong magnet that can be turned on and off because it is a coil of wire.
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What are the three basic features of electric circuits?
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Current flows from a ____________ voltage to a __________ voltage in a circuit.
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Study Notes
Electromagnet Basics
- The strength of an electromagnet can be increased by using a stronger ferromagnetic material.
- The polarity of a solenoid is determined by the direction of the current flowing through it.
- Adding more loops of wire to a solenoid enhances its strength.
Magnetic Field Generation
- Solenoids and electromagnets generate magnetic fields through electric current and coiled wires.
- An electric current produces a magnetic field around a wire.
Enhancing Electromagnetic Strength
- Four methods to enhance the strength of an electromagnet include increasing current, adding wire loops, tightening coils, and using more magnetic materials for the core.
Historical Context
- Hans Christian Oersted discovered the relationship between electricity and magnetism, demonstrating that electric current generates a magnetic field.
Properties of Electric Circuits
- Electric circuits allow electric charges to flow through a designated path and consist of energy-consuming devices, sources of electrical energy, and conducting wires.
- Current flows from areas of high voltage to lower voltage in a circuit.
Additional Facts
- Two primary methods exist to change the strength of a magnetic field: altering the current and adjusting the physical setup of the electromagnet.
- Charges in motion are the root cause of all magnetism.
- Electromagnets are used in various applications, including electric motors, earphones, and materials handling in junkyards.
Studying That Suits You
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Description
Test your knowledge of electromagnetic forces with this set of flashcards based on Chapter 7 Lesson 3. Each card presents questions that focus on key concepts such as solenoids and electromagnet strength. Perfect for reviewing essential terms and definitions in this chapter.
