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{"ops":[{"insert":"3. In an electrically neutral atom, the number of protons equals the number of __________ \nA. Electrons B. Neutrons C. Nucleons D. both neutrons and electrons \n4. All three objects have a net charge. Objects A and B attract each other. Objects B and C also attract each other, but objects A and C repel each other. Which of the following is a possible combination of the signs of the net charges of these three objects?\n I. A is positive, B is positive, C is negative \nII. A is negative, B is positive, C is positive \nIII. A is negative, B is positive, C is negative IV. \n\nA is positive, \nB is negative,\n C is positive \nA. I only B. I and II C. I, II and III \nD. III and IV \n\n5. The main difference between gravitational force and electric force is that gravitational force _______________________.\n A. is a conservative force \nB. is always attractive\nC. obeys the inverse square law\n D. is proportional to the product of the quantity that causes the force.\n"}]}
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