Question 14 (1 point) Which of the following is NOT a similarity or difference between Coulomb's law and Newton's law of universal gravitation? The electric force can attract or repel, depending on the charges involved, whereas the gravitational force can only attract. O The universal constant G is very small and in many cases the gravitational force can be ignored. Coulomb's constant kis very large, so that even small charges can result in noticeable forces. 0 The forces act along the line joining the centres of the masses or charges. 0 Coulomb's law is the product of two masses, whereas Newton's law of universal gravitation is the product of two charges. 0 The size of the force is the same as the force that would be measured if all the mass or charge is concentrated at a point at the centre of the sphere. Question 15 (1 point) How far from the centre of Earth do you need to go for g to be reduced to 0.25 of its value on the surface of Earth? 2.OrE O 0.50rE 0.41/E 0.71/E 1.4rEQuestion 16 (1 point) A planet has half of Earth's radius and half of Earth's mass. The value of g on this planet would be 06g