Cu T 200 is so called -
200 sqmm of Cu2+ over loop
200 mm of Cu over loop
For 200 days, Cu concentration does not changes
200 sqcm of Cu over loop
Ans. is 'a' i.e., 200 sq. mm of Cu+ over loop o The numbers included in the names of the intrauterine devices refer to the surface area (in sq. mm) of cooper on the device.