(a) Draw circuit diagram showing three resistors R1, Rr and a labelled Ra connected in series with a battery having potential difference V, a rheostat (Rh), a plug key (K) and an ammeter (A) using standard circuit symbol.
(b) Use this circuit to obtain the relation for combined resistance of the three given resistors by applying ohm's law.
(c) A set of 'n' identical resistors each resistance R are connected in series and the effective resistance is found to be 'X'. When these are connected in parallel, the effective resistance is found to be "Y" Find the ratio of X and Y
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