Question

If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

• A. remains unchanged
• B. reverses polarity
• C. increases
• D. decreases

Answer 1

The correct option is C increases

Induced voltage in the rotating loop is given by $E=NBAw\sin wt$
where $N$ is the number of turns in the loop, $A$ is the area of the loop, $B$ is the magnetic field and $w$ is the angular speed of rotation of loop.
$⟹E\propto w$
So, the induced voltage increases on increasing the speed of rotation of loop.