The potential difference between point $A$ and $B$ is ............. $V$
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(d) The given circuit is a balanced wheatstone bridge circuit. Hence potential difference between $A$ and $B$ is zero.
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What length of the wire of specific resistance $48 \times {10^{ - 8}}\,\Omega \,\,m$ is needed to make a resistance of $4.2 \, \Omega$ .............. $m$ (diameter of wire = $0.4\, mm$)
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