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Q. The solar corona is an extended atmosphere of hot 2*10^6 K gas surrounding the cooler visible surface of the Sun. The gas pressure in the solar corona is about 0.03Pa. What is the coronal density in particles per cubic meter?

Q. A long solenoid has 80 turns/cm and carries current i. An electron moves within the solenoid in a circle of radius 3.10 cm perpendicular to the solenoid axis. The speed of the electron is 0.0330c (c = speed of light). Find current i.

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