Urgent Answer Required. Electromagnet Design

Dear friends.

i need urgent answer. Pls Help me out.

i have to build a electromagnet in my project at following constraints.

1: I have core Ms grade 40.

2:Diameter is 30 mm not more then it.

3:Length have no constraint, can be more then 3 inches.

4:DC source 12 Volt 60Ah Car Battery.

5: Maximum Ampere not more then 2 A at 12 volt.

6: both poles are at opposite sides. through thickness of Core.

Kindly tell me coil data and length of core required to get Repel force of that electromagnet on N35 of 30mm * 30mm Piece should be 100 ponds. at 0.1 inches and at 38 mm more then 10 pounds.

I need to repel N35 of 30mm * 30mm Piece with that electromagnet. up to 38 mm distance. N35 magnet have repel force on same magnet at the distance 0.1 inches 75 pounds and at 38 mm distance it is 7 pounds.

Thanks for fast reply.