What is the magnetic field between the rails. a lead ball, Ask an Expert

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Q. A conducting rod slides at 4.0 m/s on metal rails separated by 2.0 m. If a current of 40 mA is generated in the circuit with resistance of 0.36 W, what is the magnetic field between the rails?

Q. A lead ball is dropped into a lake from a diving board 6 above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 4.30 after it is released.

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