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I a vector 2+3j+k is perpendicular41-4i +ck Then the value of α isto the ve[CBSE PMT 2005, wBJEE 2010: AIIMS 2010;Similar EAMCET 1991: AFMC 2000: AIIMS 200b) 1/2la) -1i12ld) 1rectons given by A-2i-3)d |
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Answer» if two vectors are perpendicular to each other.. then their dot product should be 0. so, (2i+3j+8k)•(-4i+4j+ak) = 0=> -8+12+8a = 0=> 8a = -4 => a = -4/8 = -1/2. option C |
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