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A proton describes a circle of radius 1 cm in a magnetic field of strength 0.10 T. What would be the radius of the circle described by an a-particle moivng with the same speed in the same magnetic field?

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` r_(1) = (mu)/(qB), r_(2) = (2mV)/(qB) `
` (r_(1))/ (r_(2)) = 2 :.r_(2)= 2 cm ` .
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