Ac Generator |

Physics Emf problem confusing?

Sunday, March 13, 2011

An ac generator consists of a 135-turn circular planar coil that is able to rotate between the poles of a magnet. The magnetic field is perpendicular to the rotational axis of the coil and has a magnitude of 0.125 T. The coil has a diameter of 0.117 m. What will the maximum emf generated by [...]

Physics Problem. EMF?

Saturday, March 12, 2011

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n ac generator has a circular coil of 88 turns and diameter 0.710 m which rotates about an axis in the plane of the coil and through its center. The coil rotates at 16.7 revolutions per second in a uniform magnetic field 0.050 T which is perpendicular to the axis of rotation. What is the [...]

Physics resistance questions?

Friday, March 11, 2011

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1. A motor has an armature resistance of 5 Ohms. If it draws 8 A when running at full speed and connected to a 125 V line, how large is the back emf? ______ Volts 2. An AC generator has 95 rectangular loops on its armature. Each loop is 13 cm long and 7 cm [...]

electromotive force ? physics questions! hurry!?

Wednesday, February 23, 2011

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1.A flexible wire loop has a radius of r = 14.0 cm and it is inside a uniform magnetic field of B = 0.306 T. The loop is grasped at points P and Q and stretched until its area is zero. It takes 194 ms to close the loop. What is the magnitude of the [...]

help PLEASE !!?

Saturday, February 5, 2011

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how does an ac generator work ? I mean how does it change the current’s direction ? i dont get this part – according to flemings right hand rule , if the magnetic field and the force act in d same direction , then how can any other factor change the current’s direction?

Question about generators and power !?

Thursday, January 6, 2011

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Water flowing through a canal at a rate of 1 * 10³ kg/s , drops through a small distance and turns a waterwheel. The wheel powers an AC generator providing electricity for a house. a) The water drops a vertical distance of 2m. Find the maximum theoretical power input to the generator. b) The generator [...]

physics question (slightly difficult)?

Friday, December 10, 2010

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The armature of a simple AC generator has 20 circular loops of wire with a radius of 10cm. It is rotated with a frequency of 60Hz in a uniform magnetic field of 800mT. What is the max value of the emf induced in the loops, and how often is this value attained?

What is the maximum induced emf in this magnetic field problem?

Thursday, November 25, 2010

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An AC generator consists of 6 turns of wire. Each turn has an area of 0.040 m^2. The loop rotates in a uniform field (B=0.20 T) at a constant frequency of 50 Hz. What is the maximum induced emf?

EM Waves Concepts Physics Problem help?

Tuesday, November 2, 2010

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Can someone help me with these physics conceptual problems? Thanks. • T/F: An antenna hookup to a dc power supply produces electromagnetic waves. • T/F: A radio wave travels at the same speed as the visible light in vacuum. • A changing magnetic field in the center of a circular loop produces a(an) (electric field, [...]

Physics – Electric Generators?

Monday, October 25, 2010

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The armature of an ac generator is a circular coil with 50 turns and radius 3.0 cm. When the armature rotates at 350 rpm, the amplitude of the emf in the coil is 17.0 V. What is the strength of the magnetic field (assumed to be uniform)? This is NON-CALCULUS based Physics! Please help me [...]