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QPage 329: Q11: HC Verma: Concepts of Physics - Volume 2 Alternating Current Page 329: Q11 Solution: A constant current of 2.8 A exists in a resistor. The rms…
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often mistakenly apply the sinusoidal rms factor $I_{rms}=I_{peak}/\sqrt{2}$ to a constant (DC) current, reducing 2.8 A to about 2 A. Remember that rms is defined as $\sqrt{\langle i^2\rangle}$; for a steady current $i(t)=I_{DC}$ this gives $I_{rms}=I_{DC}$, not $I_{DC}/\sqrt{2}$.
A constant current of 2.8 A exists in a resistor. The rms current is
Multiple Choice Options
- A 2.8 A
- B about 2 A
- C 1.4 A
- D undefined for a direct current
Step-by-Step Verified Solution
**Answer:** (a) 2.8 A.
**Step-by-Step Explanation:**
For a constant DC current, the rms value is the same as the DC value.
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