Dear Mark, I have simulated 20-cm coils. The distance between coils is dX = 3 cm. The angular spacing is 20 degrees. Focus point is 60 cm away from the coils. The force to weight ratio at focus point (x=0 cm) is 23.5. The force to weight ratio at 30 cm from the coil (x=30 cm) is 49.8. The force to weight ratio at anti-focus point (60 cm to the right from the coil, x=186 cm) is -5.2. Please see the pictures and the pdf file attached. Time spent is 1 hour Best regards, Alex ------------------------------------- Aleksandr Liubimtcev QuickField Support team http://quickfield.com e-mail: aleksandr.liubimtcev@quickfield.com On 09.11.2018 17:15, Mark Arokiaraj wrote: > Dear Alex, > > We are getting better distance in forces. > We will increase the Dimensions to 20x20 cm (7T) with 7 coils. If it > is too big the top and bottom coil each can be removed for analysis, and > we keep only 5 coils if required. > > with regards, > Mark