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NEET 2026

Exam: NEET
Year: 2026
Subject: Physics
Chapter: Alternating Current

NEET 2026 · Physics · Alternating Current

The peak value of an alternating current is 5 A and frequency is 60...

The peak value of an alternating current is

5

A and frequency is

60

Hz. How long will the current, starting from zero, take to reach the peak value ?

Options

A $\dfrac{1}{120}$ s
B $\dfrac{1}{60}$ s
C $\dfrac{1}{30}$ s
D $\dfrac{1}{240}$ s

Correct answer

D. $\dfrac{1}{240}$ s

Step-by-step solution

The alternating current is given by

I = I_0 \sin(\omega t)

.

The time taken to reach the peak value from zero corresponds to a phase angle of

\dfrac{\pi}{2}

.

\omega t = \dfrac{\pi}{2}

2 \pi f t = \dfrac{\pi}{2}

t = \dfrac{1}{4f}

Given

f = 60

Hz, we get:

t = \dfrac{1}{4 \times 60} = \dfrac{1}{240}

s.

Answer:

\dfrac{1}{240}

s

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