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[" 12.Cross-sectional area of proton bea...

[" 12.Cross-sectional area of proton beam having electric current "1 mu A" is "0.5mm^(2)" and move with "],[" velocity "3times10^(4)m/s" so current density "=.......],[[" (A) "6.6times10^(-4)C/m^(3)," (B) "6.6times10^(-5)C/m^(3)," (C) "6.6times10^(-6)C/m^(3)," (D) None of these "]]

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