GOOD IIT Advanced 2020 Question | Vector 3D JEE | JEE Advanced PYQ | vector 3d jee mains pyq | #jee
In this video we have discussed a Very GOOD Question of IIT ADVANCED of vector 3d jee advanced Chapter. Asked in IIT Advanced 2020 paper-1 having +4 marks and no negative marking. It is a fundamental concept based question which uses dot product of two vectors and cross product of two vectors and also uses Lagrange Identity. After seeing the video you will able to solve such problems very easily.....L
Question:
In a triangle PQR, let a ⃗=(QR) ⃗, b ⃗=(RP) ⃗ and c ⃗=(PQ) ⃗. If |a ⃗ |=3, |b ⃗ |=4 and (a ⃗.(c ⃗-b ⃗ ))/(c ⃗.(a ⃗-b ⃗ ) )=|a ⃗ |/(|a ⃗ |+|b ⃗ | ), then the value of |a ⃗×b ⃗ |^2 is______.
Answer: 108.00 [IIT Adv. 2020 Paper-1, Marks (+4, 0)]
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