(a) A dc power line for a light-rail system carries 1000 A at an angle of 30.0° to Earth's 5.0 x 10-5T field. What is the force on a 100m section of this line? (b) A wire carrying a 30.0A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.16 N force on the 4.00 cm of wire in the field. What is the average field strength?

(a) A dc power line for a light-rail system carries 1000 A at an angle of 30.0° to Earth's 5.0 x 10-5T field. What is the force on a 100m section of this line? (b) A wire carrying a 30.0A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.16 N force on the 4.00 cm of wire in the field. What is the average field strength?

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