(a) A rectangular carbon block has dimensions 1.0 cm x 1.0 cm x 50 cm. (i) What is the resistance measured between the two square ends ? (ii) Between two opposing rectangular faces / Resistivity of carbon at 20C is 3.5 x 10-50-m. (b) A current of 5 A exists in a 10- resistance for 4 minutes (i) how many coulombs and (ii) how many electrons pass through any section of the resistor in this time? Charge of the electron = 1.6 10-1 C.