<p>(a) Draw a labelled circuit diagram of the circuit used to show the variation of potential difference across the ends of a resistor with current flowing through it. If you use this circuit, what relation would you find between the voltmeter reading V and the ammeter reading I?</p>

<p>(b) A wire of given material having length L and area of cross section. A has a resistance of 4<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#937;</mi></math>. Find the resistance of another wire of the same material having length L/2 and area of cross-section 2A.</p>