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Old Dec 9th 2018, 11:46 AM   #1
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wire frames and dynamo

Hi

I have the query of the following nature:

In Fig. 1, a wire frame ABCD) is drawn in a homogeneous magnetic field B = 0.10 T . The points P and Q are connected to a voltmeter. Then the wire frame is mechanically driven. In this case side AD moves forward in the position shown (paper out). The wire frame has a surface of 60 cm2 and functions as a dynamo.

Query 1: Find out in which direction a current flows through the wire frame during the first quarter turn of the wire frame.


Figure 2
In figure 2 a graph of the flux 'phi' through the wire frame is drawn in the course of time. The flux can also be calculated by drawing up a sinus formula.

Query 2 : Determine the maximum voltage of this 'dynamo'.

The rotational frequency of the dynamo is reduced to half.

Query 2. Sketch the corresponding (* U ind, t) graph. **where U is Indution and is subscript ind. Thus U subscript 'ind'.
Give the characteristic points in the graph clearly with corresponding values.

++++++++++++++++++++++++++++++++++++++++++++++++++ ++++

can anyone give me some pointers on how to tackle this situation.
so that I can start to attempt this.
some feedback on how to proceed would be of assistance here.

Thanks in advance
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wire frames and dynamo-diagram-1.png   wire frames and dynamo-diagram-2.png  
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Old Dec 11th 2018, 04:43 AM   #2
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There is a well established relationship between Motion, Magnetism and Electrical Current;
see <Wikipedia:Magnetic Fields>

The "right hand rule" should answer query 1.

or <wikipedia:Flemings left-hand rule>
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Last edited by Woody; Dec 11th 2018 at 04:47 AM.
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Old Dec 20th 2018, 02:52 AM   #3
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Hi All
just wanted to come back and give the final feedback here.
(It's not me ) but my son has been able to do what was required (I think).
The resolution is as here : https://i.postimg.cc/NFXNJ2pN/problms.jpg

This was just for the records.

Thanks All !
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