Newton's Second Law in Rotational Form Practice Test

A wheel experiences net torque $\tau_{\text{net}}$; by $\tau=I\alpha$, how does increasing $\tau_{\text{net}}$ affect rotational motion if $I$ is constant?

On a disc, torque satisfies $\tau=rF\sin\theta$ and $\tau=I\alpha$. If $F$ stays constant and tangential, what happens to $\tau$ when $r$ doubles?