200CHAPTER 20 (a) From the above result, note that the induced current has greatest magnitude when B∆∆tis the greatest (that is, when the graph of Bvs. thas the steepest slope). From Figure (a) above, this is seen to be in the interval between 0 and 2.0 stt==. (b) 0 when 0B=∆∆I(that is, when Bis 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 Bis decreasing the change in the flux (and hence the induced current) is directed opposite to what it is when Bis increasing. (d) Between t, the flux through the coil is directed into the page and decreasingin magnitude. The induced current must flow 0 and 2.0 stclockwise around the coil so that the flux it generates through the interior of the coil is into the page opposing
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