Linear mass density of wire, λ=0.12kg∕m Magnetic field, B=0.5T Acceleration due to gravity, g=10m∕s2 The wire is suspended in air ⟶ magnetic force per unit length balances weight per unit length. Step 1: Write force balance For unit length of wire: Magnetic force per unit length = Weight per unit length So, IB=λg Step 2: Solve for I I=‌
