test4_ans -...

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Errata: Note 7 th formula in left hand column should have minus sign in front of t/tau. Exam Name___________________________________   MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  Figure 29.1   1) 
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In Fig.  29.1, a  wire and a  10 - Ω  resistor  are used  to form a  circuit in  the shape  of a  square, 20  cm by 20  cm. A  uniform  but  nonsteady  magnetic  field is  directed  into the  plane of  the  circuit.  The  magnitud e of the  magnetic  field is  decreased  from  1.50 T to  0.50 T in  a time  interval of  32 ms.  The  average  induced  current  and its  direction  through  the  resistor,  in this  time  interval,  are  closest to: 
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1)  _______  A) 
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190 mA, from  to  B) 
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75 mA, from  to  C) 
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130 mA, from  to  D) 
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130 mA, from  to  E) 
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75 mA, from  to  Ans D   Figure 29.3a   2) 
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A long  vertical  wire  carries a  steady 10 - A current.  A pair of  rails are  horizontal  and are    apart. A  20 - Ω  resistor  connects  points  and  b , at  the end of  the rails.  A bar is  in contact  with the  rails, and  is moved  by an  external  force with  a constant  velocity  of    as shown.  The bar  and the  rails have  negligible  resistance . At a  given  instant  the bar is    from the  wire, as  shown. In  Fig.  29.3a, at  time  t 1 the  induced  current  and its  direction  through the resistor are closest to: 
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____ ___  0 . 0 3
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This document was uploaded on 09/05/2011.

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test4_ans -...

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