A) 14 A
B) 28A
C) 56 A
D) 7 A
Correct Answer: B
Solution :
(b) 28 A Given, \[Q=5{{t}^{2}}-2t\] \[Q\left( at\,t=2 \right)=5{{\left( 2 \right)}^{2}}-2\left( 2 \right)=20-4=16\,C\] \[Q\left( at\,t=4 \right)=5{{\left( 4 \right)}^{2}}-2\left( 4 \right)=80-8=72C\] Current, \[l=\frac{\Delta Q}{\Delta t}=\frac{72-16}{4-2}=\frac{56}{2}=28\,A\]You need to login to perform this action.
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