Equivelent length (l_{e}) of a stepped shaft is (a) (l_{e}=l_{1}+left(frac{d_{1}}{d_{2}} ight)^{4} l_{2}+left(frac{d_{1}}{d_{3}} ight)^{4} l_{3}+cdots) (b) (l_{e}=l_{1}+left(frac{d_{1}}{d_{2}} ight)^{3}

Equivelent length \(l_{e}\) of a stepped shaft is

(a) \(l_{e}=l_{1}+\left(\frac{d_{1}}{d_{2}}\right)^{4} l_{2}+\left(\frac{d_{1}}{d_{3}}\right)^{4} l_{3}+\cdots\)

(b) \(l_{e}=l_{1}+\left(\frac{d_{1}}{d_{2}}\right)^{3} l_{2}+\left(\frac{d_{1}}{d_{3}}\right)^{3} l_{3}+\cdots\)

(c) \(l_{e}=l_{1}+\left(\frac{d_{1}}{d_{2}}\right)^{2} l_{2}+\left(\frac{d_{1}}{d_{3}}\right)^{2} l_{3}+\cdots\)

(d) \(l_{e}=l_{1}+\left(\frac{d_{1}}{d_{2}}\right) l_{2}+\left(\frac{d_{1}}{d_{3}}\right) l_{3}+\ldots\)