Assignment 11- Electromagnetic Induction (1)

Assignment 11- Electromagnetic Induction (1) - A Magnet and...

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Picture 3 A Magnet and a Coil When a magnet is plunged into a coil at speed , as shown in the figure, a voltage is induced in the coil and a current flows in the circuit. Part A If the speed of the magnet is doubled, the induced voltage is ________ . Hint A.1 How to approach the problem Hint not displayed ANSWER: Correct Part B The same magnet is plunged into a coil that has twice the number of turns as before, as shown in the
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Picture 6 A Magnet and a Coil Part A figure. If the speed of the magnet is again , the induced current in the coil is _______ . Hint B.1 Hint not displayed Hint B.2 Hint not displayed Hint B.3 Find the resistance of the coil Hint not displayed Hint B.4 Induced current Hint not displayed ANSWER: Correct
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A Magnet and a Coil Part A By increasing the number of turns in the coil, the induced emf increases, but so does the resistance of the coil. Since those two quantities increase by the same factor, their ratio remains constant, and the induced current in the circuit is unchanged.
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Picture 9 Picture 1 Picture 13 Picture 15 Magnetic Flux through a Coil You hold a wire coil perpendicular to a magnetic field . Part A If the magnitude of increases while its direction remains unchanged, how will the magnetic flux through the coil change? Hint A.1 How to approach the problem Hint not displayed Hint A.2 Magnetic flux Hint not displayed Check all that apply. ANSWER: Correct The magnetic flux through a coil is directly proportional to the magnitude of the magnetic field. Part B If is kept constant but the coil is rotated so that it is parallel to , how will the magnetic flux through the coil vary?
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Picture 18 Picture 20 Picture 2 Picture 24 Magnetic Flux through a Coil Part A Hint B.1 Hint not displayed Hint B.2 Hint not displayed Hint B.3 Find the cosines of the angles Hint not displayed Check all that apply. ANSWER: Correct As the orientation of the coils changes, the magnetic flux through the coil decreases. It reaches its minimum value (zero) when the coil is parallel to the field. Magnetic Flux and Induced EMF in a Coil In a physics laboratory experiment, a coil with 170 turns enclosing an area of 12.1 is rotated during the time interval 3.90×10 2 from a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of Earth's magnetic field at
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Magnetic Flux and Induced EMF in a Coil the lab location is 6.20×10 5 . Part A What is the total magnitude of the magnetic flux ( ) through the coil before it is rotated? Hint A.1 Formula for the magnetic flux through a wire loop Hint not displayed Hint A.2 The initial angle between the magnetic field and the area vector Hint not displayed Hint A.3 Definition of the weber Hint not displayed Express your answer numerically, in webers, to at least three significant figures. ANSWER:
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This note was uploaded on 04/18/2010 for the course PHYS ? taught by Professor Zhou during the Spring '10 term at Georgia State University, Atlanta.

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Assignment 11- Electromagnetic Induction (1) - A Magnet and...

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