In a particle accelerator, a current of 500 μA is carried by a proton beam in which each proton has a speed of 3 × 107 m/*. The cross seetional area of the beam is 1.50 mm2. The charge density in this beam in Coulomb/m3 is close to–
(A) 10–8
(B) 10–7
(C) 10–6
(D) 10–5
