a. A sine wave with amplitude 20Vpp is connected to a 10 k2 resistor. Calculate the peak, the rms, and the average currents through the resistor. What power rating should the resistor have? (4 marks) b. Derive the magnetic force FB on a wire of length L and cross sectional area A, carrying a current I in a uniform magnetic field B. (3 marks) c. A photon has momentum of magnitude, 8.24 x 10-28 Kg ms. (i) What is the energy of this photon? (Give your answer in J and in eV) (6 marks) (ii) What is the wavelength of this photon? (3 marks) (1 mark) (iii) In what region of the electromagnetic spectrum does it lie? d. A capacitor that is initially uncharged is connected in series with a resistor and an emf source with = 110V and negligible internal resistance. Just after the circuit is completed, the current through the resistor is 6.5x105A. The time constant for the circuit is 5.2s. What are the resistance of the resistor and the capacitance of the capacitor? (3 marks)