Question

Please answer both parts

Part A)

A 55 g horizontal metal bar, 12-cm-long, is free to slide up and down between two tall, vertical metal rods that are 12 cm apart. A 5.5×10⁻² Tmagnetic field is directed perpendicular to the plane of the rods. The bar is raised to near the top of the rods, and a 1.2 Ω resistor is connected across the two rods at the top. Then the bar is dropped.

1)What is the terminal speed at which the bar falls? Assume the bar remains horizontal and in contact with the rods at all times.

Express your answer in meters per second.

Part B)

In the rainy season, the Amazon flows fast and runs deep. In one location, the river is 25 m deep and moves at a speed of 3.8 m/s toward the east. The earth's 50 μT magnetic field is parallel to the ground and directed northward.

1)If the bottom of the river is at 0 V, what is the potential (magnitude and sign) at the surface?

Answer 1