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NEETPhysicsAlternating Current

An alternating voltage, starting from zero, takes 5 ms to reach its maximum positive value. What is the frequency of the AC source?

Options

  1. A50 Hz
  2. B100 Hz
  3. C200 Hz
  4. D0.05 Hz

Correct answer

A. 50 Hz

Step-by-step solution

The time taken by an alternating voltage to reach its maximum value from zero is one-fourth of its total time period ( T ). Therefore, T 4 = 5 ms T = 20 ms = 20 10⁻³ s The frequency f is the reciprocal of the time period: f = 1 T = 1 20 10⁻³ = 1000 20 = 50 Hz. Answer: 50 Hz

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