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Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10 Problem 11 Problem 12 Problem 13 Problem 14 Problem 15 Problem 16 Problem 17 Problem 18 Problem 19 Problem 20 Problem 21 Problem 22 Problem 23 Problem 24 Problem 25 Problem 26 Problem 27 Problem 28 Problem 29 Problem 30 Problem 31 Problem 32 Problem 33 Problem 34 Problem 35 Problem 36 Problem 37 Problem 38 Problem 39 Problem 40 Problem 41 Problem 42 Problem 43 Problem 44 Problem 45 Problem 46 Problem 47 Problem 48 Problem 49 Problem 50 Problem 51 Problem 52 Problem 53 Problem 54 Problem 55 Problem 56 Problem 57 Problem 58 Problem 59 Problem 60 Problem 61 Problem 62 Problem 63 Problem 64 Problem 65 Problem 66 Problem 67 Problem 68 Problem 69 Problem 70 Problem 71 Problem 72 Problem 73 Problem 74 Problem 75 Problem 76 Problem 77 Problem 78 Problem 79

Problem 56 Hard Difficulty

Unreasonable Results
(a) What resistance would you put in parallel with a $40.0-\Omega$ galvanometer having a $25.0-\mu \mathrm{A}$ sensitivity to allow it to be used as an ammeter that has a full-scale deflection for $10.0-\mu \mathrm{A}$ ? (b) What is unreasonable about this result? (c) Which assumptions are responsible?

Answer

$25>10$

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Physics 102 Electricity and Magnetism
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Chapter 21

Circuits, Bioelectricity, and DC Instruments

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Problem 79

Video Transcript

So in this problem, we have ah, Gavin ometer and that we want to connected connected the internal resistance with another one so that Ah, we get another, uh, full scale. So because it isn't there is connected in peril. So we have Ah, this is the are one are two and this is the current I want and currently too and the total current I. So from the problem, we see that the regional internal resistance of the common nominator are one is 40 homes and, uh, the current flow Well, our one is maximally 25 microns Pierce and ah, if now we get our two connected with our wanting parable so we want to get I as maximum value 10 microbe appears so. But apparently this is not possible because ah, we have I equal. I won class All right too, right? If we just way simply add another resisted here. So typically the eye to here it should be positive. So if I was 25 and I turned so we cannot see any positive solution for I too, right? So that's the reason why this is this is no reasonable. If we want to make this problem reasonable. We actually need to set the total current. I is at the least, the greater than 25. My crime here's okay.

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