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AP EAMCET202420 May 2024Morning ShiftPhysicsMathematics in PhysicsActual

If | P + Q |=| P |=| Q | then the angle between P and Q is

Options

  1. A0^
  2. B120^
  3. C60^
  4. D90^

Correct answer

B. 120^

Step-by-step solution

| P + Q |=| P |=| Q | P ^2+ Q ^2+2 PQ = P ^2= Q ^2 P ^2+ P ^2+2 P ^2 = P ^2 2 P ^2(1+ )= P ^2 =- 1 2 = 120^ =120^

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