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  4. In copper voltameter, mass deposited in 30 s is m gram. If the time-current graph is as shown in figure, ECE of copper is

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Q. In copper voltameter, mass deposited in $30 \,s$ is $m$ gram. If the time-current graph is as shown in figure, ECE of copper isPhysics Question Image

Current Electricity

Solution:

$z =m / I t$,
From graph, It $=$ Area $O A B C$
$=\frac{1}{2}(10+30) \times \frac{100}{1000}=2$
$\therefore z=m / 2=0.5\,m$