Q9.5Multiple choice
A rigid bar of mass M is supported symmetrically by three wires each of length l . Those at each end are of copper and the middle one is of iron. The ratio of their diameters, if each is to have the same tension, is equal to
- (a)Ycopper/Yiron Yiron
- (b)Ycopper Y iron
- (c)2 Y copper
- (d)Yiron . Ycopper