Final Exam Phy-113-01 Sping-2023 Section -II (Problem solving each carrying 5 marks: 8 X 5 = 40) 31. Calculate the electric field at a field point of 0.02 um from a point charge of q = +20 nC? 32. What is the equivalent resistance of 200 resistors each of 0.02 ohm are connected in parallel to an external circuit of +220 V? 33. Find the magnetic field (B) due to current of 1.5 A through a solenoid of length of 0.2 m and has the number of coils 5000? 34. Find the index of refraction of second medium when light suffers total internal reflection from first medium (n = 1.3) with critical angle of 260? 35. Find the slit separation (d) of a diffraction grating consists of a large number of thin parallel slits used in a light (450 nm)? (m = 2, and 0 = 909)? 36. Find length contraction of a sub-atomic particle moving at a speed 98% of speed of light ? 37. Calculate energy of the atomic state with n = 8? 38. Find the lifetime (Tmean) of a radioactive nucleus with half-life (T1/2) of 100 ns