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# In a region $10^{19}$ a particles and $10^{19}$ protons move to the left, while $10^{19}$ electrons move to the right per second. Find the total charge.

$\begin{array}{1 1}(A)\;6.4\;c \\(B)\;8.9\;c \\(C)\;1.4\;c \\(D)\;9.8\;c \end{array}$

An $\alpha$ a particle has a charge equal to 2 protons.
Total charge on $\alpha$ particles $= 2 × 1.6 × 10^{–19}\; C$
Total charge on protons $= 2 × 1.6 × 10^{–19}\; C$
Total charge on electrons $= 2 × 1.6 × 10^{–19}\; C$
$Q = 10^{19} × (2 × 1.6 × 10^{–19}) + 10^{19} × (1.6 × 10^{–19}) + 10^{19} × (1.6 × 10^{–19})$
$Q = 10^{19} × 10^{–19} [ 3.2 + 1.6 + 1.6] = 6.4 \; C$