Which section of the IPC lays down provisions relating to Doctrine of Jus Necessitates?

IPC: The doctrine of the jus necessitatis recognizes that the law has to be broken to achieve a greater good. According to doctrine the violation of a law may be excused by necessity.  Section 81.   Act likely to cause harm, but done without criminal intent, and to prevent other harm: Nothing is an offence merely by reason of its being done with the knowledge that it is likely to cause harm, if it be done without any criminal intention to cause harm, and in good faith for the purpose of preventing or avoiding other harm to person or property. Explanation—It is a question of fact in such a case whether the harm to be prevented or avoided was of such a nature and so imminent as to justify or excuse the risk of doing the act with the knowledge that it was likely to cause harm.