Question 28 Question 29 1 pts A positively charged particle of mass m = 4.72 x10-25 kg and charge q = +5e is Determine the current through resistor Ri in the circuit pictured below if the current flowing travelling at a constant speed v = 5.6 x10 m/s towards a region with a uniform through R4 is 0.3 A. Give your answer to 2 decimal places. magnetic field, perpendicular to the charge's initial velocity and of strength B = 2 T. R1 = 60 Determine the radius r of the charge's trajectory in metres, just as it enters the R. = 20 field. Give your answer to 2 decimal places. R3 = 3 0 B R1 = 90 RA P O R3 R1 R2 Question 30 1 pts E An ionic solution contains free charge carriers in a liquid. A potential difference of 31 V is placed between two points (R and S) in the solution. The time taken for a group of charges to move between these two points is 12s, and, in this time, the energy of the charges changes by 13 J. What is the resistance of liquid? Give your answer to O decimal places