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The current in an a.c. circuit is I=5 sin(120π t) A. The time taken by the current to reach its peak value starting from zero is

Asked in JEE Main 27th June 1st Shift 2022 · Instantaneous values and timing

• (1) 1/(60) s
• (2) 60 s
• (3) 1/(120) s
• (4) 1/(240) s

Step-by-step solution

Why the other options are wrong

• (1) Gives the full period T=1/(60) s.
• (2) Inverts a frequency to a large time.
• (3) Gives half a period (T/2).

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