Hoop (circumferential) stress induced in a thin walled 'Horton Sphere' used for the storage of liquid ammonia under pressure is
A
$$\frac{{{\text{pD}}}}{{2{\text{t}}}}$$
B
$$\frac{{{\text{pD}}}}{{4{\text{t}}}}$$
C
$$\frac{{{\text{pD}}}}{{3{\text{t}}}}$$
D
$$\frac{{{\text{pD}}}}{{6{\text{t}}}}$$
Correct Answer: $$\frac{{{\text{pD}}}}{{2{\text{t}}}}$$