Question

Will a penny be slightly more massive if it has a negative or a positive net charge? (Think very small!!) (a) It will be just as massive either way. (b) More massive if negative. (c) More massive if positive. A charged conducting object is brought close to a neutral insulating object. Which of the following is true? (a) The objects will repel. (b) The objects will attract. (c) Nothing will happen, no attraction, no repulsion. (d) The objects will repel as long as the charge on the conducting object is negative. (e) The objects will attract as long as the charge on the conducting object is positive. An object has a net electric charge of +3.2 mu C. How many electrons would need to be added to make it electrically neutral? (a) 2.0 times 10 (b) 2.0 times 10 (c) 3.2 times 10 (d) 3.2 times 10 (e) 5.0 times 10 Four point charges are fixed at the corners of a square, as illustrated. Which of the arrows shows the correct direction of the net electric force that acts on the charge in the upper right corner, due to the presence of the other three? Three point charges are located along the x-axis, as illustrated. The charge in the middle has a mass of 4.0 times 10-9 kg. Calculate the magnitude and the direction of the acceleration of the charge in the middle when it is allowed to move, if the others remain fixed in place. Questions 27 and 28. Consider the two point-charged shown in this diagram. They together produce an electric field at point P, in the direction shown. Which of the following is true about charge Q? (a) Q is positive, with |Q| = |q| (b) Q is positive, with |Q| > |q| (c) Q is negative, with |Q| = |q| (d) Q is negative, with |Q| > |q| If the lower charge were negative instead, is there any way the field could have the direction shown in the figure? (a) Yes, if Q is positive. (b) Yes, if Q is negative. (c) No, there is no way.

Answer 1