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JEE Main202117 Mar 2021Morning ShiftPhysicsAlternating CurrentActual

An A C current is given by I = I 1 s i n ω t + I 2 c o s ω t . A hot wire ammeter will give a reading:

Options

  1. AI 1 2 - I 2 2 2
  2. BI 1 2 + I 2 2 2
  3. CI 1 + I 2 2
  4. DI 1 + I 2 2 2

Correct answer

B. I 1 2 + I 2 2 2

Step-by-step solution

I = I 1 s i n ω t + I 2 c o s ω t ∴ I 0 = I 1 2 + I 2 2 ∴ I r m s = I 0 2 = I 1 2 + I 2 2 2

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