JEE Main · 2022 · 25 Jul 2022 · Shift 2 · Differential Equations

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Let a smooth curve be such that the slope of the tangent at any point ( ) on it is directly proportional to . If the curve passes through the point and , then is equal to
  1. (A)
  2. (B)4✓ Correct
  3. (C)1
  4. (D)

Answer: (B)

Solution

The differential equation is for some constant . This gives , integrating: , so . Using : , so . Using : , giving , so , hence . Thus . At : . Therefore .

JEE Main · 2022 · 25 Jul 2022 · Shift 2 · Single correct option

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