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Q.

The magnitude of the projection of the vector a = 4i -3j + 2k on the line which makes equal angles with the coordinate axes is

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a

12

b

13

c

3

d

2

answer is B.

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Detailed Solution

a=4i-3j+2k  b=i+j+k projection=a.bb=4-3+21+1+1=33=3

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