26_Chapter 20 HomeworkCH20 Induced Voltages and Inductance

26_Chapter 20 HomeworkCH20 Induced Voltages and Inductance...

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200 CHAPTER 20 (a) From the above result, note that the induced current has greatest magnitude when B ∆∆ t is the greatest (that is, when the graph of B vs. t has the steepest slope). From Figure (a) above, this is seen to be in the interval between 0 and 2.0 s tt == . (b) 0 when 0 B =∆ I (that is, when B is constant). This is true in the interval t = between 2.0 s and 4.0 s . (c) No. The direction of the induced current will always be such as to oppose the change that is occurring in the flux through the coil. When B is decreasing the change in the flux (and hence the induced current) is directed opposite to what it is when B is increasing. (d) Between t , the flux through the coil is directed into the page and decreasing in magnitude. The induced current must flow 0 and 2.0 s t clockwise around the coil so that the flux it generates through the interior of the coil is into the page opposing
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