Question

if the arm of couple is doubled its moment will??

Answer 1

its moment will be doubled

Answer 2

We know that couple is a equal amd parallel forces which are oppositely directed.

And the moment (turning effect of a force) of a couple is dependent on the two for the two forces of a couple.

Now if we double the amountss of the forces or the sides of the couples ,then the moment of the new couple will also be doubled in terms of magnitude.