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NDA 2 2024 GAT, question 122

Topic: Physics

Q122

The AC mains domestic supply current in India changes direction in every

  1. (a) 50 s50\text{ s}
  2. (b) 150 s\frac{1}{50}\text{ s}
  3. (c) 100 s100\text{ s}
  4. (d) 1100 s\frac{1}{100}\text{ s}Correct answer

Solution.

Answer: (d) 1100 s\frac{1}{100}\text{ s}

  1. At 50 Hz, a full cycle lasts T=1/50=0.02 s.
  2. Alternating current reverses direction every half-cycle, so the interval is 0.01 s.