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Q. A cosmic-ray proton in interstellar space has an energy of 18.0 MeV and executes a circular orbit having a radius equal to that of Earth's orbit around the Sun (1.50 1011 m). What is the magnetic field in that region of space?

Q. A uniform horizontal wire with a linear mass density of 0.50 g/m carries a 1.8 A current. It is placed in a constant magnetic field with a strength of 4.00 10-3 T. The field is horizontal and perpendicular to the wire. Neglect the magnetic field of the Earth.

As the wire moves upward starting from rest, what is its acceleration.

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Category:- Physics
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