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Question : 22 of 150
Marks:
+1,
-0
Solution:
Since,
, and
are mutually perpendicular to each other, then
−=.=.=0 |++|2=(++).(++) ‌‌‌‌‌‌‌ [∵||2=.] =||2+||2+||2+2(.+.+.) =1+1+1+2(0+0+0) ‌‌‌‌‌‌‌ [∵.=.=.=0] ⇒|++|2=3 ∴|++|2=√3
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