The instantaneous value of current in an a.c. circuit is $I=2 \sin \left[100 \pi t+\frac{\pi}{3}\right]$ A. The current will be maximum for the first time at $\left(\sin 90^{\circ}=1\right)$
- A$\frac{1}{100} \mathrm{~s}$
- B$\frac{1}{200} \mathrm{~s}$
- C$\frac{1}{400} \mathrm{~s}$
- D$\frac{1}{600} \mathrm{~s}$
✓ Correct answer: D
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