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Q.

The charge flowing in a wire is given by $q = 3 t^{2} - 2 t + 7 C$ . The electric current at time $t = 2$ sec is

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a

20 A

b

5 A

c

10 A

d

15 A

answer is B.

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Detailed Solution

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$q = 3 t^{2} - 2 t + 7$

$i = \frac{d q}{d t} = 6 t - 2$

$A t t = 2 s, i = 10 A$

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