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A vector vecF(1) is along the positive X...

A vector `vecF_(1)` is along the positive `X`-axis. If its vectors product with another vector `vecF_(2)` is zero then `vecF_(2)` could be

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The correct Answer is:
4
Let `vecF_1 =khati because vecF_1 xx vecF_2=0`
`" "vecF_2` may be in x-direction
So `" "vecF_2=-4hati`
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