The circuit shown here is used to compare the $e.m.f.$ of two cells ${E_1}$ and ${E_2}({E_1} > {E_2})$. The null point is at $C$ when the galvanometer is connected to ${E_1}$. When the galvanometer is connected to ${E_2}$, the null point will be
ATo the left of $C$
BTo the right of $C$
CAt $C$ itself
DNowhere on $AB$
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ATo the left of $C$
a (a) $E \propto l$ (balancing length)
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