Magnetic Field |

In electric generator, emf is created by a changing the flux in a loop. The flux is changed by?

Thursday, July 14, 2011

A. changing the total area of the loop B. changing the strength of the magnetic field involved C. changing the relative orientation of the field and the loop D. both (a) and (b) E. both (b) and (c) I put D. A and B, can anyone confirm please? Thank you. i based my answer on [...]

In electric generator, emf is created by a changing the flux in a loop. The flux is changed by?

Wednesday, July 13, 2011

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In electric generator, emf is created by a changing the flux in a loop. The flux is changed by? A. changing the total area of the loop B. changing the strength of the magnetic field involved C. changing the relative orientation of the field and the loop D. both (a) and (b) E. both (b) [...]

Physical science homework help!?

Thursday, July 7, 2011

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1)Electromagnetic induction uses a magnetic field to create which of the following? A. magnetic field B. electric current C. electromagnetism D. magnetic domain 2)Which of the following describes the production of an electric current by moving a loop of wire through a magnetic field or moving a magnet through a wire loop? A. electromagnetism B. [...]

Can I convert an electric start mower starter into a wind turbine generator?

Thursday, June 30, 2011

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I know that electricity is produced from a rotating magnetic current, and a rotating magnetic current is produced around an electrified wire. This starter is designed so that a shaft with copper wire coiled around it has a current passed through it creating a rotational magnetic field that spins the shaft. Is it possible for [...]

Flux, Faraday, Lenz, and Generators?

Sunday, June 26, 2011

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A square coil of wire with 15 turns is in a magnetic field of 0.13 T. The total flux through the coil is 0.73 T·m2. (a) Find the area of one turn if the field is perpendicular to the plane of the coil. m2 (b) Find the area of one turn if the field makes [...]

HELLLP! with physics – generators?

Saturday, June 25, 2011

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K. in my textbook, it shows a graph of the magnetic flux threading a coil over time. Underneath it has a graph of emf over the same time… it looks like this. http://openbookproject.net//electricCircuits/AC/02306.png You’ll notice that when magnetic flux is at a maximum, emf is at 0. Now I’m struggling to understand (this may not [...]

Physics problem-AC generators related…?

Thursday, June 23, 2011

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If you wrapped a wire around Earth’s equator at an altitude of 200 km and ran an electric current though it in the westerly direction, what effect would this have on the Earth’s natural magnetic field at the Earth’s surface?

Electromagnetic induction question?

Tuesday, June 21, 2011

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The coil of an AC generator has 160 turns, a length of 100mm and a width of 10mm. It spins in a unifrom magnetic field of 12mT at a constant frequency of 50Hz. Caclculate the peak voltage.

science test questions?

Sunday, June 12, 2011

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a device that changes mechanical energy into electrical energy by rotating a coil of wire through a magnetic field is called a a. generator b. electromagnet c. current meter d. transformer

Flux, Faraday, Lenz, and Generators?

Wednesday, June 8, 2011

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In 0.17 s, a coil of wire with 48 loops experiences an average induced emf of 8.0 V, due to a changing magnetic field perpendicular to the plane of the coil. The radius of the coil is 16 cm, and the initial strength of the magnetic field is 3.0 T. Assuming that the strength of [...]