A long wire having total resistance of 10 Ω is made into a solenoid with 20 turns of wire per centimeter. The wire is connected to a battery, which provides a current in order to produce a 0.04 T magnetic field through the center of the solenoid. What voltage must this battery have?

• A. 6.3×10⁻³ V
• B. 160 V
• C. 16,000 V
• D. 6.4×10⁸ V