The same magnetic force makes larger torque at larger lever arm. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
One-meter arm keeps torque equal to force
Force 24 N applied at arm 1 m gives torque 24 N m.
τ=24×1=24
Two-meter arm doubles torque
Force 24 N applied at arm 2 m gives torque 48 N m.
τ=24×2=48
Three-meter arm triples torque
Force 24 N applied at arm 3 m gives torque 72 N m.