@Rukumar
Firstly, there no such law where a wife can claim s*xual intercourse was against her will or without her consent, as there is no such provision in IPC. However this might be construed as cruelity, only if proved.
Now if she can prove that there was s*xual intercourse and which was forced, then only this allegation would be considered else not. Following are the important factors while considering this allegation:
> On-going marital dispute before this allegation was made
> Medical report showing any sort of injuries on her body or private parts.
> Nature of other allegations and if she can show an prima-facie proof in that regard
Unless all of the above does not support her version, you need not worry at all. However, if she can show proof in above points, then I need not mention you are going to jail..
//peace
/Saurabh.V