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If the position vector vec a at the poin...

If the position vector `vec a` at the point (5,n) is such that |`vec a`| = 13 find the value of n.

A

`pm8`

B

`pm12`

C

8 only

D

12 only

Text Solution

Verified by Experts

The correct Answer is:
B
`sqrt((5-0)^(2)+(n-0)^(2))=13`
`25+n^(2)=169`
`n^(2)=144`
`n=pm12`
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