All the edges of a block with parallel faces are unequal. Its longest edge is twice its shortest edge. The ratio of the maximum to minimum resistance between parallel faces is.

Answer

4

Explanation

Let the length of various edges in increase order be l, x, 21 respectively
`R _(max) = ( rho 2l )/( x l ) = ( 2 rho )/( x)`
` R _(min ) = ( rhol )/( 2 l x ) = ( rho )/( 2x)`
`therefore ( R _(max))/( R _(min)) = 4`