» emf

Two generators use the same magnetic field and operate at the same frequency. Each has a single-turn circular?

Admin — Tue, 02 Aug 2011 13:31:48 +0000

Two generators use the same magnetic field and operate at the same frequency. Each has a single-turn circular coil. One generator has a coil radius of 3.8 cm and a peak emf of 1.8 V. The other generator has a peak emf of 3.9 V. Find the coil radius r of this other generator.

A rectangular loop with 100 turns and area of 0.12 m2 rotates at 100 rad/s. The axis of rotation of the square?

Admin — Mon, 01 Aug 2011 15:55:22 +0000

A rectangular loop with 100 turns and area of 0.12 m2 rotates at 100 rad/s. The axis of rotation of the square is perpendicular to the direction of the magnetic field of 0.025 Tesla. What is the maximum emf induced in the loop?

The emf produced in a generator is What is the frequency of rotation of the circular coil?

A digital multimeter shows 4.4 A reading in an ac circuit. What is the maximum value of the ac current in the circuit?

What is the strength of the magnetic field?

Admin — Fri, 29 Jul 2011 13:30:38 +0000

A generator consists of 10 turns of wire, and each turn has an area of 0.095^2 m. If a maximum emf of 120V is induced when the coil rotates with a frequency of 60Hz, what is the strength of the magnetic field?

a- 0.85 T
b- 0.34 T
c- 0.15 T
d- 1.5 T
Its b ^_^

Quantifying the emf induced in a generator?

Admin — Wed, 27 Jul 2011 11:06:30 +0000

A generator is made from a set of 7000 loops of area 5.00 cm2 rotating at an angular frequency of 600 radians per second. The magnetic field is created by a solenoid, completely surrounding the generator coil, and carrying a current of 0.600 A. How many turns per unit length must the solenoid have in order for the generator to generate a peak emf of 1000 V?

Please show how you got your answer, thanks!

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

Admin — Wed, 13 Jul 2011 13:30:41 +0000

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) and (c)

I put D. A and B, can anyone confirm please? Thank you.

HELLLP! with physics – generators?

Admin — Sat, 25 Jun 2011 13:31:36 +0000

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 be relevant to the year 12 course) but, how can emf be 0 when magnetic flux is at a maximum? Shouldn’t there be a maximum emf when the magnetic field is threading the entire area of the coil?

URGENT: Physics Question!?

Admin — Mon, 23 May 2011 15:55:20 +0000

A circular coil has 275 turns and a radius of 0.045 m. The coil is used as an AC generator by rotating it in a 0.500 T magnetic field. At what angular speed should the coil be rotated so that the maximum emf is 175 V?
The answer is supposed to be w = 50 rad/s.

Electromag Physics Help?

Admin — Thu, 19 May 2011 20:44:00 +0000

A generator uses a coil that has 120 turns and a 0.65-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a square (an approximation), determine the length of the wire from which the coil is made.

Flux, Faraday, Lenz, and Generators?

Admin — Sun, 08 May 2011 18:19:53 +0000

The plane of a conductive loop with an area of 0.042 m2 is perpendicular to a uniform magnetic field of 0.38 T. If the field drops to zero in 0.0044 s, what is the magnitude of the average emf induced in the loop?
V

a square loop side a is mounted on vertical shaft and rotated at angular velocity omega .a uniform magnetic fi?

Admin — Thu, 28 Apr 2011 11:06:29 +0000

a square loop side a is mounted on vertical shaft and rotated at angular velocity omega .a uniform magnetic field B points to the right .find the emf E(t) for tttthis alternating current generator ?