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A beam of protons travelling at 1.00×105 m/s has a current density of 1.00 mA/m2. What is the density of protons in the beam? 2.46×104 m−3 3.28×108 cm−3 6.25×1010 m−3 7.25×1012 m−3

A beam of protons travelling at 1.00×105 m/s has a current density of 1.00 mA/m2. What is the density of protons in the beam? 2.46×104 m−3 3.28×108 cm−3 6.25×1010 m−3 7.25×1012 m−3

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A beam of protons travelling at 1.00 × 10 5 m / s has a current density of 1.00 m A / m 2 . What is the density of protons in the beam? 2.46 × 10 4 m − 3 3.28 × 10 8 c m − 3 6.25 × 10 10 m − 3 7.25 × 10 12 m − 3

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