Consider a 25-cm-long zero-resistance metal rod that moves horizontally on frictionless, zero-resistance parallel rails at a constant speed of 12 m/s within a 0.15 T uniform magnetic field, as shown below. The rails are connected by a conducting path that has a resistance of 1.5Ω. Determine the force required to maintain the rod's speed.

• A. 1.1×10^-2 N
• B. 6.0×10^-3 N
• C. 8.0×10^-2 N
• D. 9.0×10^-3 N

Answer: (A)