At first,i created a simple schematic of non-inverting amplifier using LM741 having a gain of 2. The supplied a.c voltage at non-inverting input is 1V having frequency of 50 Hz. And i get the result what i had expected, the output voltage of 2 v peak and 50 Hz.
In the second scenario, i kept all the parameter same expect i grounded the negative voltage supply and i get unexpected result. Peak voltage at the output is 800 mv and lower voltage is -200mv. And the screenshot of the simulated waveform is presented below.