Magnetic Field |

please help physics question?

Friday, September 10, 2010

The coil of a generator has a radius of 0.24 m. When this coil is unwound, the wire from which it is made has a length of 5.1 m. The magnetic field of the generator is 0.10 T, and the coil rotates at an angular speed of 35 rad/s. What is the peak emf of [...]

homework help? (5 multiple choice) =]?

Tuesday, September 7, 2010

1 Comment

Answer anyone that u think u might know… Thanx Fer all your help ! Much Appreciated ! <3 1) When a calcium atom forms an ion, it loses two electrons. What is the electrical charge of the calcium ion? A: -2 B: -1 C: +1 D:+2 2)Which particle builds a static electric charge when it is transferred from one object to another? A: [...]

I need help with 2 basic quetions?

Sunday, September 5, 2010

1 Comment

Quote In the simplest terms, a motor works by current moving through a magnetic field, creating mechanical movement (spinning a rotor).Quote Can some one explain this better. Quote A dynamo works in reverse – mechanical movement spins a magnetic field, creating current. Quote sorry I do not know how a dynamo works or how a [...]

what is the max emf output? what would be the max emf output if 10 such loops were used instead?

Saturday, September 4, 2010

1 Comment

a student makes a simple generator by using a single sq. loop 10 cm on each side. the loop is then rotated at a frequency of 60Hz in a magnetic field of 0.015T.

moving on to light speed?

Tuesday, August 31, 2010

10 Comments

a guy I know who is working for boeing, and he has told me alot of interesting things about what they are doing to move us forward in space travel. He said that they are working on a device that reduces the actual weight of objects by produceing a unusual magnetic field . he said [...]

Determine the length of the wire from which the coil is made…?

Sunday, August 29, 2010

1 Comment

A generator uses a coil that has 117 turns and a 0.517 T magnetic field. The frequency of this generator is 45.0 Hz, and its emf has an rms value of 115 V. Assuming that each turn of the coil is a square (an approximation), determine the length of the wire from which the coil [...]

the angular velocity of a coil (Very tricky according to examiners report)?

Friday, August 27, 2010

2 Comments

A generator is made from 100 turn coil, 3cm by 4 cm placed in a magnetic field of strength 0.1T. The coil rotates at 50 rev/sec. At a position when the magnetic field is perpendicular to the coil, calculate: i) the amount of magnetic flux that passes through each turn ii) the angular velocity of the coil [...]

A fix to the earths declining Magnetic Field and Pole Shift?

Wednesday, August 25, 2010

5 Comments

Many Scientists believe that the Earths Polarity could be getting ready to Shift. But before that Shift, it is stated that Polarity could completely or almost completely disapear for a period of time that is unkown. In such an event the earth would be susceptable to Cosmic rays, and Sun Radiation. Increasing the number of [...]

Is it just me or is integrating an electromagnetic generator into a helicopter's rotor system a great idea?

Tuesday, August 24, 2010

4 Comments

Think about it: have a controlled magnetic field in the region of the spinning helicopter blades, and have the blades or some part of the spinning apparatus be a magnetic material. The constant rotation in the field will supply a potential difference – free electricity for the helicopter. Now I’m not sure of the logistics or [...]

What does a transformer do? (not the robots) easy 2 points?

Saturday, August 21, 2010

3 Comments

Hi i need help with these question of true or false…unnecessary comments arent appreciated…. True or False 6) In a generator a loop of wire is mechanically rotated in a magnetic field in order to induce an alternating CURRENT 10) A tranformer steps ENERGY up or down

Tag Archive | "magnetic field"

please help physics question?

homework help? (5 multiple choice) =]?

I need help with 2 basic quetions?

what is the max emf output? what would be the max emf output if 10 such loops were used instead?

moving on to light speed?

Determine the length of the wire from which the coil is made…?

the angular velocity of a coil (Very tricky according to examiners report)?

A fix to the earths declining Magnetic Field and Pole Shift?

Is it just me or is integrating an electromagnetic generator into a helicopter's rotor system a great idea?

What does a transformer do? (not the robots) easy 2 points?

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