PRE-LAB PREPARATION SHEET FOR LAB 4-BATTERIES, BULBS, AND CURRENT (Due at the be
ID: 1882208 • Letter: P
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PRE-LAB PREPARATION SHEET FOR LAB 4-BATTERIES, BULBS, AND CURRENT (Due at the beginning of lab) irections: ead over Lab 4 and then answer the following questions about the procedures. . Explain why in Activity 1-1 the angle irons will be charged in several dif- ferent ways Sketch below one arrangement of the battery, bulb, and wire (other than the one in Figure 4-3) that you will study in Activity 1-2. 2. At this time, which of the models shown in Figure 4-6 for how current flows in a circuit do you favor? Why? 3. Describe briefly how you will test the models for current. What device will you use to measure current? 4.Explanation / Answer
Answer 1-1: When the angle irons were charged using the rubbing method, suppose we charge a rubber rod by rubbing it with wool and hold it near the pith ball of an electroscope. The ball is first attracted to the rod and then, if the ball touches the rod, it immediately rebounds. The ball is first attracted to the rod and then, on touching it, is repelled from it.
Answer 1-2: Now deliberately put a charge on the electroscope pith ball by rubbing a hard rubber rod with wool flannel and touching it to the ball. After touching, the ball is repelled by the rod. Now let us rub a glass rod with silk and hold it near the pith ball. We discover that it is attracted to the ball. The ball responds differently to the glass rod than it does to the rubber rod. This tells us that we are dealing here with two different kinds of electricity, positive and negative electricity.
However, if a negatively charged rod, for example, is brought near a neutral object, the electric field of that rod will cause induced charges of opposite sign to appear on the near side of the object and induced charges of the same sign to appear on the opposite side of the object, because the force of attraction is greater for close charges than for far ones, the object will be pulled towards the rod. The logic is the same for the case of a positively charged rod.
Question1-3 and Question 1-4 & 1-5 : are incomplete or not Provided in the image ( Activity 1-2 is not mentioned and Fig 4.6 is not given)
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