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Question #40513
The Question
The Argand plane is embedded in as the plane . The origin of maps to . The real axis of coincides with the line of intersection of and the -plane, with the positive real direction having positive . The imaginary axis of coincides with the -axis. Let be the region in defined by the inequalities and . A solid in is bounded below by the -plane (), above by the plane , and laterally by the vertical cylinder passing through the boundary of the orthogonal projection of onto the -plane. Find the volume of the solid .
Options
- A.
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- D.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Bridge
Practice problems that bridge the gap between foundational theory and advanced practical application.
Concepts Behind This Question
Geometry of Complex Inequalities|Line-Plane intersection logic|Region Ambiguity
Why This Question Is Tricky
Common Mistakes
This question tests the 'Region Ambiguity' trap by embedding a complex inequality into a 3D volumetric projection.
Students typically solve by assuming the base , yielding the region .
They critically fail to consider the case where the base , which flips the inequality to , adding the entire punctured unit disk to the locus.
This omission leads to a massive mismatch in the integration limits.
Furthermore, mapping the Argand plane to a skewed 3D plane forces a coordinate transformation (Jacobian ) before integrating the volumetric cross-section, punishing rote memorization of 2D area formulas.
Quick Facts About This Question
Question Information
| Subject | Mathematics |
| Chapter | Complex Numbers and Quadratic Equations - Class 11 |
| Concept | Geometry of Complex Inequalities |
| Difficulty | 8 |
| Cognitive Load | 7 |
| Target Solve Time | 160 sec |
| Access | Free |