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Question

How will you write the vector joining points P(1, 3,2) and Q(4, 2, 1)? Also write the unit vector for PQ


A

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B

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C

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D

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Solution

The correct option is D


For two point P and Q, the vector PQ looks like this

PQ = position vector Q – position vector P

=(4^i+2^J+^k)(^i+3^j+2^k)PQ=3^i^J^k

And unit vector of PQ is written ˆPQ {a unit vector always wears a hat)

Which is given as =PQ|PQ|

So ˆPQ=3^i^j^k32+12+12=3^i^j^k11


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