Example 1 · difficulty 4/5
A conducting rod of length 0.40 m slides with a constant speed of 5.0 m s⁻¹ on smooth parallel rails that are connected through a resistance of 2.0 Ω. A uniform magnetic field of 0.50 T acts perpendicular to the plane of the rails. Neglecting the resistance of the rod and rails, the force required to maintain the constant speed, and the power delivered by the external agent, are respectively:
- A. 1.0 N, 5.0 W
- B. 0.10 N, 0.50 W
- C. 0.20 N, 1.0 W
- D. 0.025 N, 0.125 W