Q.

Two vector A=3i^+8j^2k^andB=6i^+16j^+xk^ are such that the component of B perpendicular toA  is zero. Then the value of x will be :

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a

8

b

8

c

4

d

+4

answer is B.

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Detailed Solution

A=3i^+8j^2k^

B=6i^+16j^+xk^

|i^j^k^382616x|

=(8x+32)(3x+12)+0=0

5x+20=0

5x=20

x=4

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