A stone is attached to one end of a string and rotated in a vertical circle. If string breaks at the position of maximum tension, it will break at
A)\[A\]
B)\[B\]
C)\[C\]
D)\[D\]
Correct Answer:
B
Solution :
The body is describing a vertical circle, \[\therefore \] \[T-mg\cos \theta =\frac{m{{v}^{2}}}{l}\] or \[T=mg\cos \theta +\frac{m{{v}^{2}}}{l}\] Tension is maximum when \[\cos \theta =+1\] and velocity is maximum. Both condition are satisfied at\[\theta ={{0}^{o}}\](ie, at lowest point\[B\]).