T Single Choice The current flowing...
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T Single Choice The current flowing through a wire depends on time as I = 31- +21+5. The charge flowing through the cross-section of the wire in time from 1 = 0 to 1 = 2s is: A 220 B. 200 c 150 DSC

JEE/Engineering Exams
Physics
Solution
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( frac{d Q}{d t} I ) ( d Q=I d t ) ( d theta=left(3 t^{2}+2 t+5right) d t ) ( int d Q=int_{0}^{2}left(3 t^{2}+2 t+5right) ) ( =left[t^{3}+t^{2}+5 tright]_{0}^{2}=3 t^{2}+2 t+5 ) ( =frac{8+4+10}{10+4} ) ( =frac{10}{10+4} )
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