1.

If the position vectors of P, Q, R and S are 2hati+hatj, hati-3hatj, 3hati+2hatj and hati mu+hatj respectively and PQ"||"RS, then the value of mu is

Answer»

`-7`
7
`-6`
None of these

Solution :Now, `PQ= (hati - 3 hatj)-(2 hati + hatj) = - hati-4hatj`
`and RS= - 2hati + (mu - 2)hatj`
Given,`PQ||RS RARR PQ= lambda RS`
`-hati - 4 hatj =[ lambda { - 2hati +(mu-2)hatj}]`
`rArr lambda = 1//2 and mu = -6 `


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