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Question
The resultant of two vectors of magnitudes 3 units and 4 units is 1 unit.  What is the magnitude of their cross product?
 
Options:
A .  12 units 
B .  7 units 
C .  1 units 
D .  zero 
Answer: Option D
:
D
The magnitude of A×B=ABsinθ=3×4×sin180=0.
Hence the correct choice is (d)

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