In a Certain Particle Accelerator,a Current of 800 $\mu$ A Is Carried by a 6

Multiple Choice

In a certain particle accelerator,a current of 800 $\mu$ A is carried by a 6.00-MeV proton beam that has a radius of 1.50 mm.The mass of a proton is 1.67 $\times$ 10^-27 kg.How many protons per unit volume are in this beam?

A) 3.24 $\times$ 10¹³ protons/m³
B) 7.76 $\times$ 10¹³ protons/m³
C) 1.57 $\times$ 10¹³ protons/m³
D) 2.09 $\times$ 10¹³ protons/m³
E) 4.34 $\times$ 10¹³ protons/m³