V=ð*(0.1)^2*0.01*50=0.0157Volts approximately=0.016(2 d.c).
I think this way is much easier.
Btw did you find 0.0157 or 0.016 exactly?
I found 0.0157 but I rounded it off.
You are right that you can do it both ways, whichever is easier is personal choice I guess..... I just like the neat way that it relates to the rate of change of flux, but is subtly different.