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例1、两个相同的金属小球,分别带电后分开一定距离,其静电力大小为F。若将两小球接触一下后再分别放回原处,发现其静电力大小仍为F,则这两个小球原来所带电荷为:A.一定是等量的同种电荷;B.可能是不等量的同种电荷;C.可能是不等量的异种电荷;D.不可能是异种电荷。“上当”途径:不等量的同种电荷接触后,要发生电量转移,一个增加一个减小,电量之积可能不变,因而两球间静电力可能保持不变,所以,应选B。
Example 1, two identical metal balls, separated by a certain distance after electrification, the electrostatic force is F. If the two balls are touched and then put back into place, and their electrostatic force is still F, the original charge of the two balls is: A. must be the same amount of the same charge; B. may Is not equal to the same kind of charge; C. may not be the same amount of different types of charges; D. can not be heterogeneous charges. “Dangdang” approach: After an equal amount of charge of the same kind comes into contact, the quantity of electricity to be transferred will increase. If one increases or decreases, the quantity of electricity may not change, so the electrostatic force between the two balls may remain unchanged. Therefore, B should be selected.