Chapter 23 - Magnetic Flux and Faraday's Law of Induction - Problems and Conceptual Exercises - Page 834: 83

$0.29V$

We can find the average induced emf as follows: $\epsilon_{avg}=(N)|\frac{\Delta \phi}{\Delta t}|$ $\implies \epsilon=(N)|\frac{BA-0}{\Delta t}|$ We plug in the known values to obtain: $\epsilon_{avg}=(1.3)|\frac{(1.3)(0.058)(0.082)}{21\times 10^{-3}}|=0.29V$