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Two forces of magnitude F having a r...

Two forces of magnitude F having a resultant of the same magnitude of ,F the angle between the two forces is ______

A

`45^@`

B

`60^@`

C

`120^@`

D

`150^@`

Text Solution

Verified by Experts

The correct Answer is:
C
Magnitude of each force is F
` therefore ` The resultant force `= F = sqrt( F^2 +F^2 + 2F .F cos theta )`
`F^2 = 2F^2 cos theta implies cos =- 1/2 implies theta = 120^@`
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