Static electricity occurs when two surfaces rub together, and electrons from one surface move to the other, generating a net negative charge. When this negatively charged surface comes in contact with a conductor, the electrons jump from this surface to the conductor, and can be seen as a static spark.
Two students examined the effect of air humidity and static spark production.
The students ﬁrst rubbed the surfaces of various materials together for 3 minutes at a constant air humidity, and counted the number of visible static sparks. The procedure was repeated three times, and the averages were calculated and are presented in Table 1. The results are summarized below.
To test the effect of humidity on static shock production, the students rubbed a balloon with a cloth for a given length of time. At the end of the time interval, the balloons were held against a wire that lead to a voltmeter to measure the output of electricity. The results are summarized in Table 2.
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Had a fourth trial been performed in Experiment 2, the measured voltages for the 10 second, 30 second, 45 second, and 1 minute intervals, respectively, would have been closest to:CorrectIncorrect
The students repeated Experiment 1 with an additional material and obtained the following results, summarized in the table below.
Material X has a static electricity potential that is:CorrectIncorrect
According to Table 1, as humidity increases, spark productionCorrectIncorrect
The students rubbed a balloon with a cloth in the same method used in Experiment 1. They then recorded the voltage of static electricity production, and found the average output to be 2700 volts. According to these data and the data in Table 2, the students most likely rubbed the balloon for a period of how long?CorrectIncorrect
The students hypothesized that in the winter, peopleʼs hair is often more static due to increased snowfall. Is this hypothesis consistent with the data presented?CorrectIncorrect