1. The problem statement, all variables and given/known data A 61 mg mass just balances the balance arm of a current balance when the strip current is 3.0 A. If the strip is 2.2 cm long, what is the magnetic field strength inside the solenoid in which the current balance is located? 2. Relevant equations F = BIl (Magnetic Field x Current x Length) F = mg (Mass x Gravity) 3. The attempt at a solution I was thinking that the weight of the mass is equal to the force of the magnetic field so I made the forces equal to each other. BIl = mg and solved for B B = mg/Il = 9.06 T but it turns out the answer is wrong... Can someone please help me?