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Home  >>  AIMS  >>  Class12  >>  Physics
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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} $

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1 Answer

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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 $
The total charge is
$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 $
Hence A is the correct answer.
answered May 28, 2014 by meena.p
 

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