The impedance is found using pythagoras.

sqrt( r^2 + (wl)^2)= sqrt( 100^2 +(2 * pi() * 200 * 0.1)^2) = 161 ohms

so now as V = Iz

I = V/z = 30 / 161 = 0.187 Amps RMS

Note that the peak value is sqrt(2) * I RMS