The instantaneous value of an alternating current is given by $I = 50 \sin(100 \pi t)$. It will achieve a value of $25 \ A$ after a time interval of (given $\sin 30^{\circ} = 0.5$):
- A$\frac{1}{300} \ s$
- B$\frac{1}{100} \ s$
- C$\frac{1}{200} \ s$
- D$\frac{1}{600} \ s$
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