Assertion [A]: Myometrium is an important layer of the uterus.
Reason [R]: Myometrium allows the uterus to enlarge in pregnancy and causes strong contractions during parturition.
Match the following:

Two concentric thin circular rings of radii 50 cm and 40 cm each, carry a current of 3.5 A in opposite directions. If the two rings are coplanar, the net magnetic field due to the two rings at their centre is: