For an $A.C.$ current $I = 100 \sin(200 \pi t)$,after what time does the current reach its maximum value?
- A$\frac{1}{100} \ s$
- B$\frac{1}{200} \ s$
- C$\frac{1}{300} \ s$
- D$\frac{1}{400} \ s$
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