1.

The equilibrium equation in polar coordinates is given by _____________

A. ( frac{1}{r} frac{ _{r }}{ }+ frac{ _r- _ }{r}=0 )
B. ( frac{ _r}{ r}+ frac{ _{r }}{ }+ frac{ _r- _ }{r}=0 )
C. ( frac{ _r}{ r}+ frac{1}{r} frac{ _{r }}{ }+ frac{ _r- _ }{r}=0 )
D. ( frac{ _r}{ r}+ frac{1}{r} frac{ _{r }}{ }=0 )
Answer» D. ( frac{ _r}{ r}+ frac{1}{r} frac{ _{r }}{ }=0 )


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