Physics Help Forum wire frames and dynamo

 Electricity and Magnetism Electricity and Magnetism Physics Help Forum

 Dec 9th 2018, 11:46 AM #1 Junior Member   Join Date: Dec 2018 Posts: 2 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 Attached Thumbnails
 Dec 11th 2018, 04:43 AM #2 Senior Member     Join Date: Jun 2016 Location: England Posts: 961 There is a well established relationship between Motion, Magnetism and Electrical Current; see The "right hand rule" should answer query 1. or topsquark and dellpotro like this. __________________ ~\o/~ Last edited by Woody; Dec 11th 2018 at 04:47 AM.
 Dec 20th 2018, 02:52 AM #3 Junior Member   Join Date: Dec 2018 Posts: 2 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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