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Current Density: a Proton Beam That Carries a Total Current

Question 4

Multiple Choice

Current density: A proton beam that carries a total current of 1.3 mA has 10.0 mm diameter. The current density in the proton beam increases linearly with distance from the center. This is expressed mathematically as J(r) = J0 (r/R) , where R is the radius of the beam and J0 is the current density at the edge. Determine the value of J0.


A) 25 A/ Current density: A proton beam that carries a total current of 1.3 mA has 10.0 mm diameter. The current density in the proton beam increases linearly with distance from the center. This is expressed mathematically as J(r) = J<sub>0</sub> (r/R) , where R is the radius of the beam and J<sub>0</sub> is the current density at the edge. Determine the value of J<sub>0</sub>. A) 25 A/ B) 6.2 A/ C) 12 A/ D) 17 A/
B) 6.2 A/ Current density: A proton beam that carries a total current of 1.3 mA has 10.0 mm diameter. The current density in the proton beam increases linearly with distance from the center. This is expressed mathematically as J(r) = J<sub>0</sub> (r/R) , where R is the radius of the beam and J<sub>0</sub> is the current density at the edge. Determine the value of J<sub>0</sub>. A) 25 A/ B) 6.2 A/ C) 12 A/ D) 17 A/
C) 12 A/ Current density: A proton beam that carries a total current of 1.3 mA has 10.0 mm diameter. The current density in the proton beam increases linearly with distance from the center. This is expressed mathematically as J(r) = J<sub>0</sub> (r/R) , where R is the radius of the beam and J<sub>0</sub> is the current density at the edge. Determine the value of J<sub>0</sub>. A) 25 A/ B) 6.2 A/ C) 12 A/ D) 17 A/
D) 17 A/ Current density: A proton beam that carries a total current of 1.3 mA has 10.0 mm diameter. The current density in the proton beam increases linearly with distance from the center. This is expressed mathematically as J(r) = J<sub>0</sub> (r/R) , where R is the radius of the beam and J<sub>0</sub> is the current density at the edge. Determine the value of J<sub>0</sub>. A) 25 A/ B) 6.2 A/ C) 12 A/ D) 17 A/

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