An ammeter of internal resistance 1 Ω is connected in series with two resistors of 4 Ω and 6 Ω across an 11 V battery of negligible internal resistance.
(i) Calculate the potential difference across the 6 Ω resistor when the ammeter is in the circuit.
(ii) The ammeter is now removed and replaced by a wire of negligible resistance. Calculate the new potential difference across the 6 Ω resistor.
(iii) Determine the percentage change in the potential difference across the 6 Ω resistor due to the removal of the ammeter.