A) -40V
B) 40V
C) 140V
D) 300V
Correct Answer: B
Solution :
Given, magnetic flux \[(\phi )=5{{t}^{3}}-100t+300\] \[\therefore \] \[\frac{d\phi }{dt}=15{{t}^{2}}-100\] Induced emf \[e=-\frac{d\phi }{dt}\] \[=-(15{{t}^{2}}-100)\] After \[t=2s.\] \[e=-(15\times {{2}^{2}}-100)\] \[=-(60-100)\] \[=40V\]You need to login to perform this action.
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