Verified Solution • 2025–26 Session
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QPages 306-313: Q4: HC Verma: Concepts of Physics - Volume 2 Electromagnetic Induction Pages 306-313: Q4 Solution: A conducting circular loop having a radius of 5.0 cm, is placed …
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often compute the loop’s area as $A = r^2$ or $A = pi r$ instead of the correct $A = pi r^2$, omitting the factor $pi$ and drastically under‑ or over‑estimating the flux. Always write the area formula explicitly before substituting the radius (in metres) to avoid this error.
A conducting circular loop having a radius of 5.0 cm, is placed perpendicular to a magnetic field of 0.50 T. It is removed from the field in 0.50 s. Find the average emf produced in the loop during this time.
Step-by-Step Verified Solution
**Answer:** Average emf = 7.8 _ 10__ V.
**Step-by-Step Explanation:**
Initial flux __ = BA = 0.50 _ �(0.05)_ = 3.93 _ 10__ Wb. Final flux = 0. E = __/_t = 3.93 _ 10__/0.50 = 7.8 _ 10__ V [citation:10].
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