Question 13 1 pts An object O is placed next to a unknown lens (located at the lens line shown). The diagram shows three real rays from the top of O passing through the lens. lens line Which type of lens is it; and what type of image is produced by the lens when the object O is in this position? concave lens; image is real, upright and diminished ' convex lens; image is virtual, inverted and enlarged ' concave lens; image is virtual, inverted and diminished convex lens; image is real. upright and enlarged convex lens; image is virtual, upright and enlarged Question 14 1 pts Two initially neutral objects are rubbed together to make them electrically charged. After they are separated, the electric force between the two objects: ' Can be either attractive or repulsive or zero. ' Must be repulsive. - Can either be repulsive or zero. Must be attractive. ' Can either be attractive or zero. 9 Question 15 Two charges separated by 1 metre. exert an electric force of 10 N on each other. If the charges are pushed together so that they are now only 1/9th of a metre apart, determine the new electric force on each charge. Give your answer to zero decimal places