What is the size and polarity of charge qz? (It 12 LLC 15. Identical 12uC charges are placed at the ends of a metre stick. 20. The electric field at point P in the diagra What is the size and polarity of charge 12 UC (+ ) What is the electric potential at point P at the 60 cm mark on the metre stick? + A. 9.0 . 104 V 9 = 20 B. 3.8 . 105 V C. 4.5 . 105 V D. 9.8 . 105 V POLARITY A. 16. Alpha particles with a mass of 6.6 . 10-27 kg and a charge of 3.2 . 10-19 C are fired B. towards each other from a great distance. C. D 1= 6.6x10kg Q - 32%10-19C Q - 32x10-PC 19. A proton is made to trave shown in the diagram below If they each have a speed of 2.5 . 10' m/s to start with, what will be their minimum as it travels from A to B? separation distance? (4 marks) A proton A. It is increasing B. It is decreasing C. It is increasing th D. It is decreasing