Q.

Find the vector product (a X b) of the two given vectors:a=2i+3j+4k,b=3i+5j . Here, i, j & k are unit vectors along three mutually perpendicular axes

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a

-20i + 12j + k

b

10i – 6j -1/2k

c

20i – 12j – k

d

10i + 6j + 1/2k

answer is A.

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Detailed Solution

Explanation: The cross product of a & 
b=i020 j012+k109=20i+12j+k
Note that this is not the same as b X a.

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