An ion with a charge of +2e enters perpendicularly to a magnetic field of strenghth 0.12T.If the speed of the ion is 2.4^4 m/s and it follows an arc of radius 9.4^-3m the mass of ion is
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mv^2/r =qvB
total charge of particel 2×1.6×10^-19C
m=2×1.6×10^-19 ×9.4×10^-3x0.12 /2.4x10^4
m =2.5 x 10^-25kg
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