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In the given circuit of potentiometer, t...

In the given circuit of potentiometer, the potential difference E across AB (10m length) is larger than `E_(1) and E_(2)` as well. For key`K_(1)` (closed), the jockey is adjusted to touch the wire at point` J_(1)` so that there is no deflection in the galvanometer. Now the first battery `(E_(1))` is replaced by second battery `(E_(2))` for working by making `K_(1)` open and `K_(2)` closed. The galvanometer gives then null deflection at `J_(2)` The value of `(E_(1))/(E_(2))` is `(a)/(b)` where a=____.

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