A very thin circular disk of radius r 1300 cm has charge, Ask an Expert

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A very thin circular disk of radius R = 13.00 cm has charge Q = 20.00 mC uniformly distributed on its surface. The disk rotates with a constant angular velocity ? = 3.00 rad/s around the z axis through its center.

What is the magnetic field strength on the z axis at a distance d = 130.0 cm FROM THE CENTER?

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