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Q.

The quantity of charge q (in coulombs) that has passed through a surface area 2cm2 varies with time according to the equation q=4t3+5t+6 where t is in seconds. What is the instantaneous current through the surface at t=1s?

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a

17 A

b

29 A

c

34 A

d

15 A

answer is B.

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Detailed Solution

q=4t3+5t+6 I(1s)=dqdtt=1s=12t2+5t=1s=17A

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