JEE AdvancedMathematicsEllipseMCQ+3 / −1
Match the conics in Column I with the statements/expressions in Column II :
| Column I | Column II | ||
|---|---|---|---|
| (A) | Circle | (P) | The locus of the point () for which the line touches the circle . |
| (B) | Parabola | (Q) | Points z in the complex plane satisfying . |
| (C) | Ellipse | (R) | Points of the conic have parametric representation |
| (D) | Hyperbola | (S) | The eccentricity of the conic lies in the interval . |
| (T) | Points z in the complex plane satisfying . |
- A(A) (P); (B) (S), (T); (C) (R); (D) (R), (S)
- B(A) (P); (B) (S), (T); (C) (R); (D) (Q), (S)
- C(A) (P); (B) (S), (T); (C) (S); (D) (R), (S)
- D(A) (P); (B) (P), (T); (C) (R); (D) (Q), (S)
View written solutionFree
Correct answer: B
To solve this matching problem, we need to analyze each statement/expression in Column II and determine the type of conic section it represents. Then we can match it with the conic names in Column I.
Analyzing Column II
Statement (P): The locus of the point () for which the line touches the circle .
- The equation of the given circle is . This is a circle with its center at the origin and radius .
- The equation of the line is , which can be rewritten as .
- The condition for a line to be tangent to a circle is that the perpendicular distance from the center of the circle to the line is equal to the radius of the circle.
- The perpendicular distance from a point to a line is given by .
- Here, , , , and . The radius is .
- So, we must have:
- Squaring both sides gives:
- The locus of the point is . This is the equation of a circle.
- Therefore, (A) (P).
Statement (Q): Points z in the complex plane satisfying .
- Let . The equation represents the locus of a point in the complex plane.
- is the distance of the point from the point . Let's call this point . So .
- is the distance of the point from the point . Let's call this point . So .
- The equation is . This means the difference of the distances of any point on the locus from two fixed points (foci) and is a constant, which is .
- This is the definition of a hyperbola.
- The distance between foci is , so . The constant difference is , so .
- Since (), it is indeed a hyperbola.
- Therefore, (D) (Q).
Statement (R): Points of the conic have parametric representation .
- We can use the standard substitution . This gives and .
- Substituting these into the given parametric equations:
- To find the Cartesian equation, we can eliminate the parameter using the identity .
- This is the standard equation of an ellipse centered at the origin, with semi-major axis and semi-minor axis .
- Therefore, (C) (R).
Statement (S): The eccentricity of the conic lies in the interval .
- Let's recall the eccentricities () for different conic sections:
- Circle:
- Ellipse:
- Parabola:
- Hyperbola:
- The interval includes and all values greater than 1. This corresponds to both Parabola and Hyperbola.
- Therefore, (B) (S) and (D) (S).
Statement (T): Points z in the complex plane satisfying .
- Let .
- The left-hand side (LHS) is . LHS .
- The right-hand side (RHS) is .
- Equating LHS and RHS:
- This is the standard equation of a parabola with its vertex at the origin and opening to the right.
- Therefore, (B) (T).
Matching Summary
- (A) Circle matches with (P).
- (B) Parabola matches with (S) and (T).
- (C) Ellipse matches with (R).
- (D) Hyperbola matches with (Q) and (S).
This gives the following mapping:
- (A) (P)
- (B) (S), (T)
- (C) (R)
- (D) (Q), (S)
Comparing with Options
- A: (A) (P); (B) (S), (T); (C) (R); (D) (R), (S) - Incorrect because (D) maps to (Q), not (R).
- B: (A) (P); (B) (S), (T); (C) (R); (D) (Q), (S) - This option correctly matches all our findings.
- C: (A) (P); (B) (S), (T); (C) (S); (D) (R), (S) - Incorrect because (C) does not map to (S) and (D) does not map to (R).
- D: (A) (P); (B) (P), (T); (C) (R); (D) (Q), (S) - Incorrect because (B) does not map to (P).
The correct option is B.
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