Question 17 7.5 pts The half-life of 30P is 2.50 minutes. If a sample of 30p has 1.60 x 1010 nuclei present initially, after 10.0 minutes how many remain? 0 0.100 x 1010 0 0.050 x 1010 0 0.800 x 1010 0 0.400 x 1010 O 0.200 x 1010D Question 18 7.5 pts Three point charges are located on the x-axis. The first charge, q1 = 10.0 mC, is at x = -1.00 m; the second charge, q2 = 20.0 mC, is at the origin; and the third charge, q3 = -30.0 mC, is located at x = 2.00 m. Which charge is subjected to the force of greatest magnitude? 0 91 O q1 and q2 experience equal forces of equal magnitude 0 92 0 93 Previous NextD Question 19 7.5 pts Two equipotential lines (red lines) are drawn in the images below. The equipotential lines represent a 10 V surface and a 5 V surface. Electric field lines are denoted as blue arrows. Which of the following diagrams is correctly illustrating the direction of the electric field? (a) (b) LO V 10 V . 5 V 5 V ( c) 10 V # 10 V 5 V 5 V o d O b OC O a Previous