Electricity and Magnetism 31. State Ohm's law and calculate the resistance of a wire if a current of 2 A flows through it when a voltage of 10 V is applied. (2 marks) 32. Describe the concept of electric field and calculate the electric field due to a point charge of 5 C at a distance of 2 m. (k = 8.99 x 10^9 N m/C) (3 marks) 33. Explain the principle of electromagnetic induction. (3 marks) 34. What is the capacitance of a parallel plate capacitor with an area of 1 m and a separation of 1 mm filled with a dielectric constant of 4? (E. = 8.85 x 10^-12 F/m) (3 marks) 35. Calculate the power consumed by a 100 W bulb when connected to a 220 V supply. (2 marks) 36. Describe the working principle of a transformer. (3 marks) 37. Explain the concept of magnetic flux and its units. (3 marks) 38. Calculate the force between two parallel conductors 1 m apart carrying currents of 10 A each. (Use = 4 x 10^-7 T m/A) (3 marks) 39. Describe the difference between alternating current (AC) and direct current (DC). (3 marks) 40. What is the potential difference across a 5 Q resistor carrying a current of 3 A? (2 marks)