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Questions and Answers
A copper wire is moved through a magnetic field. Which action will NOT result in an induced potential difference across the wire?
A copper wire is moved through a magnetic field. Which action will NOT result in an induced potential difference across the wire?
- Moving the wire parallel to the magnetic field lines. (correct)
- Moving the wire at an angle of 45 degrees to the magnetic field lines.
- Moving the magnetic field while the wire is stationary.
- Moving the wire perpendicularly to the magnetic field lines.
A magnet is repeatedly moved in and out of a coil of wire connected to a closed circuit. Which change would increase the magnitude of the induced current?
A magnet is repeatedly moved in and out of a coil of wire connected to a closed circuit. Which change would increase the magnitude of the induced current?
- Reducing the number of turns of wire in the coil.
- Increasing the strength of the magnetic field. (correct)
- Decreasing the speed at which the magnet is moved.
- Using a weaker magnet.
A bar magnet is pushed into a coil of wire. According to the principles of electromagnetic induction, what effect does this have on the coil?
A bar magnet is pushed into a coil of wire. According to the principles of electromagnetic induction, what effect does this have on the coil?
- The coil remains unaffected, as the magnetic field only induces a current but no magnetic polarity.
- The end of the coil nearest the approaching magnet becomes the opposite pole, attracting the magnet and aiding its motion.
- The end of the coil nearest the approaching magnet becomes the same pole, repelling the magnet and opposing its motion. (correct)
- The entire coil becomes temporarily magnetized with a polarity unrelated to the approaching magnet's polarity.
A generator uses mechanical energy to induce an electric current in a coil of wire. What happens to the mechanical energy input?
A generator uses mechanical energy to induce an electric current in a coil of wire. What happens to the mechanical energy input?
A square loop of wire is placed in a uniform magnetic field. Under which conditions will the induced current in the loop be zero?
A square loop of wire is placed in a uniform magnetic field. Under which conditions will the induced current in the loop be zero?
Flashcards
Induced Potential
Induced Potential
Potential difference produced across a wire moving through a magnetic field.
Generator Effect
Generator Effect
Induced potential creates a current in a complete circuit.
Factors Affecting Induced Potential
Factors Affecting Induced Potential
Field strength, wire speed, coil shape and number of turns.
Induced Current's Magnetic Opposition
Induced Current's Magnetic Opposition
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Energy Transfer in Induction
Energy Transfer in Induction
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Description
Explore induced potential and the generator effect. Learn how wire movement in a magnetic field creates potential difference and current. Discover factors influencing the size of induced potential, including magnetic field strength and coil shape.
