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  4. A prism is made of wire mesh with each side having equal resistance R. A battery of 6 V and zero internal resistance is connected across E and F as shown in the figure. The current in the branch A D, if R is equal to 5 Ω, is.

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Q. A prism is made of wire mesh with each side having equal resistance $R$. A battery of $6\, V$ and zero internal resistance is connected across $E$ and $F$ as shown in the figure. The current in the branch $A D$, if $R$ is equal to $5\, \Omega$, is.Physics Question Image

Current Electricity

Solution:

The figure can be redrawn as
image
There will be no current through I and II.
So III, IV and V will be in series.
$I=\frac{6}{3 R}=\frac{6}{3 \times 5}=0.4 A$