Hints:

Consider the right hand rule.

Given the information in the table above, determine:

$1)$ the required force couple on the handle, F$1,$

Answer for part $1$

$[$N$],(3$ sigfig$)$

$2)$ the radius of the metal rod in the screwdriver if the required force when holding the metal $($F$2)$ is $4\backslash$times F$1,$

Answer for part $2$

$[$mm$],(3$ sigfig$)$