मोर वृत्त (Mohr's circle) की त्रिज्या निम्नलिखित में से किस परिमाण को दर्शाती है?

When a bar of length l and uniform cross-section is rigidly fixed at the upper end and hangs freely, the total elongation produced in the bar due to its own weight is given by (where w = weight per unit volume and E = Modulus of Elasticity):

The hoop stress set up in a thin cylinder subjected to internal fluid pressure is: