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Question
The direction ratios of the line which is perpendicular to the lines with direction ratios –1, 2, 2 and 0, 2, 1 are _______.
Options
–2, –1, –2
2, 1, 2
2, –1, –2
–2, 1, –2
Solution
–2, 1, –2
`abs [[hat"i",hat"j",hat"k"],[-1,2,2] ,[0,2,1]]`
=`hat "i"(2-4) -hat"j"(-1)+hat"k"(-2)`
= `- 2hat"i" +hat"j" - 2hat"k"`
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