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 AD, if R is equal to 5  Ω is

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a

0.6 A

b

2 A

c

0.4 A

d

0.8 A

answer is C.

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Detailed Solution

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The figure can be redrawn as

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There will be no current through I and II. So III, IV and V will be in series.

I=63R=63×5=0.4A

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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 AD, if R is equal to 5  Ω is