1.

The string of pendulum of length \[l\] is displaced through \[{{90}^{o}}\] from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is                                                  [MP PMT 1986]

A.             \[mg\]
B.                      \[3mg\]
C.             \[5\,mg\]          
D.             \[6\,mg\]
Answer» C.             \[5\,mg\]          


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