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Sir please i am immediate need of answer to question C from this list..My board exams are coming near.

Sir please i am immediate need of answer to question C from this list..My board exams are coming near.

Question Image
Grade:12

1 Answers

Aditya Raj
26 Points
4 years ago
Using the concept of vector triple product-
ax(bxc)=(a.c)b-(a.b)c  ,we get
ax(bxc)=(a.c)b-(a.b)c=(1/2)b
comparing lhs and rhs we get,
a.c=1/2  & a.b=0
So,as a,b & c are unit vectors,so their magnitude is 1 each.
|a||c|cos(@)=1/2 & |a||b|cos(@)=0
therefore angle between a and c=60 & that b/w a & b=90

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