Emf | - Part 2

Physics, what rotational speed is necessary?

Tuesday, April 12, 2011

A generator has 200 turns of wire on a coil of radius 2.00 cm. What rotational speed is necessary to produce an emf of amplitude 4.50 V if the magnetic field in the region of the coil is 0.180 T? 60.0 rad/s 16.0 rpm 100 rpm 500 rpm 950 rpm

Help: 1. explain how a simple ac generator (alternator) works.?

Saturday, April 9, 2011

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2.The magnetic field between two poles of a magnet is increasing at the rate of 0.05T/s. A conducting loop of area = 100cm^2 is placed within this magnetic field. The loop is connected to a circuit whose total resistance is 10Ω. Find both the emf and the current that are induced in the circuit as [...]

Physics. Primary and secondary transformers. electromagnetic?

Monday, April 4, 2011

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1) The primary of a transformer has 350 turns and a voltage of 120 V across its terminals. What is the output voltage of the secondary if it has 180 turns? Answer:48V 2)An ac generator consists of a 135-turn circular planar coil that is able to rotate between the poles of a magnet. The magnetic [...]

Hi! Help me please I really appreciate it so much. Thank you?

Sunday, April 3, 2011

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In a model AC generator, a 498 turn rectangular coil 14.0 cm by 21 cm rotates at 124 rev/min in a uniform magnetic field of 0.65 T. (a) What is the maximum emf induced in the coil? ___ V (b) What is the instantaneous value of the emf in the coil at t = (π/30) [...]

Induction and alternating current? Please helppp?

Thursday, March 31, 2011

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A 250-turn generator with circular loops of radius 15 cm rotates at 60.0 rpm in a magnetic field with a strength of 1.00 T. a. What is the angular speed of the loops? b. What is the area of one loop? c. What is the maximum emf? d. What is the rms emf?

The armature of an ac generator is a rectangular coil 2.0 cm by 6.0 cm with 80 turns.?

Tuesday, March 29, 2011

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It is immersed in a uniform magnetic field of magnitude 0.45 T. If the amplitude of the emf in the coil is 17.0 V, at what angular speed is the armature rotating?

help with electromagnetic induction problem!! please help!!?

Thursday, March 24, 2011

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in the united states, the national power grid supplies ac to ordinary costumers with a maximum voltage of 170 V at 60 Hz (the standard is 120 V "average" household service). Given that a generator has a 100 turn coil of area 0.50 m^2, what strength should magnetic field have? currently I am using the [...]

Suppose you wanted to use the Earth's magnetic field to make an AC generator at a location where the…?

Saturday, March 19, 2011

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Suppose you wanted to use the Earth’s magnetic field to make an AC generator at a location where the magnitude of the field is 0.502 mT. Your coil has 1060 turns and a radius of 5.21 cm. At what angular velocity would you have to rotate it in order to generate an emf of amplitude [...]

Physics Emf problem confusing?

Sunday, March 13, 2011

1 Comment

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

1 Comment

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 [...]