1. Two charged particles, one carrying a charge of +5 .0 C and the other a charge of -15 C, are 0.75 m apart. a) What is the magnitude of the electric force between these two charged particles? (4 marks) b) Are the particles attracting or repelling each other? (I mark) 2. A current of 12.5 A ows through an electric heater operating on 120 V. a) What is the heater's resistance? (2.5 marks) b) What is the heater's power consumption? (2.5 marks) 3. Two transformers have the same basic construction but have different input voltages and number of turns of wires. The transformers are: Transformer A: VP = 25.0 V, NP = 200.0 turns, Ns = 250.0 turns Transformer B: VP = 50.0 V, NP = 100.0 turns, Ns = 50.0 turns a) Calculate the output voltage of each transformer. (2 marks each; 4 marks total) b) Which of these two transformers is a step up transformer? (I mark) 4. a) What is the frequency of a blue light of wavelength of 4.70 x 10'7 In? (2.5 marks) b) What is the wavelength of a green light of frequency 5.70 x 1014 Hz? (2.5 marks) 5. Complete the chart below by identifying the atomic number, number of neutrons, and number of protons of the following nuclei. (5 marks total) a) Atomic number b) Number of neutrons c) Number of protons Show your computations below