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Q. A cylindrical tank with an open top has a diameter of 3.10 m and is completely filled with water. When the afternoon Sun reaches an angle of 25.0° above the horizon, sunlight ceases to illuminate the bottom of the tank. How deep is the tank?

Q. Charge is uniformly distributed around a ring of radius R = 2.25 cm and the resulting electric field magnitude E is measured along the ring's central axis (perpendicular to the plane of the ring). At what distance from the ring's center is E maximum?

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