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Q.

The charge flowing in a conductor varies with time as Q=at-bt2. Then, the current 

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a

Increases linearly with time

b

Reaches a minimum and then increases

c

Falls to zero at time t=a/2b

d

Changes at a rate =-2b/a

answer is C.

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Detailed Solution

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I=dQdt=a−2bt . Current decreases linearly with time. 

I=0 for t=(a/2b) and (dI/dt)=-2b

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