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A proton in the Solar wind strikes the Earth’s magnetic field at a right angle with...

A proton in the Solar wind strikes the Earth’s magnetic field at a right angle with a velocity of 2.75 x 105m/s. If the field has strength of

4.33 x 10-5T and the Lorentz force acts to move the proton in a circle, what’s the radius of this circle?

         A) 0.0589m    B) 6.08 x 1019m   C) 2.64 x 10-10m   D) 66.3m     

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