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Question

If V1=^i2^j+3^k and V2=a^i+b^j+c^k where a,b,c{1,0,1,2,3} then find the numbers of non-zero vectors V2 which are normal to V1.

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Solution

V2 is normal to V1
V1.V2=0
(i2j+k)(ai+bj+ck)=0
a2b+3c=0
If a=1,
3c2b=1
c=1,b=11
If a=0,
3c=2b
c=0,b=02
orc=2,b=33
If a=1,
2b3c=1
c=1,b=14
b=2,c=14
If a=2,
2b3c=2
c=0,b=16
orc=2,b=33
If a=3,
2b3c=3
c=1,b=07
b=3,c=18
8 non-zero vectorsV2 are possible

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