The Current in a Wire Varies with Time According to the Relation

question 89

Multiple Choice

The current in a wire varies with time according to the relation
I = 40 $\pi$ cos(10 $\pi$ t)
Where I is in amperes and t is in seconds. The number of coulombs that pass a cross section of the wire in the time interval between t = 0 and t = 1/20 s is

• A) 2 \(\pi\)
• B) 4 \(\pi\)
• C) 40 \(\pi\)
• D) 4
• E) zero

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