ral 2017 su Physics 212 Test 2n A 1. A negative charge sits at the origin. Where
ID: 1777913 • Letter: R
Question
ral 2017 su Physics 212 Test 2n A 1. A negative charge sits at the origin. Where is the electrie potential (V) minimum? (a) At the origin (b) Atinfinity (c) Somewhere in between (d) Can't determine 2. The diagram shows four capacitance. The value of the electrie potential is given for the two plates the capacitance. Rank the pairs according to the magnitude of the electric field between the plates, greatest to least AnswerA +70V +20V 70V-10V A) 1, 2, 3, 4 B) 2, 4, 1,3 C) 3, 1, 4, 2 D) 4, 3, 2,1 E) 3, 2,4, 1 3 13. Consider the three resistors and the battery in the circuit shown. Which resistors, if any, are connected in parallel? Answer a) R2and R b) R2 and R Ri and Rs d) Ri and R2 and R e) This cannot be determined Ry . Two capacitors A and B are connected in parallel for a long time and CA-Ca/2. How d Answer n capacitor A compare to that on B? 2. he charge on a parallel-plate capacitor is halved Ans electric field is doubled capacitance is doubled electric field is halved capacitance is halved urface charge density is not changed on either plateExplanation / Answer
1] Potential due to a charge is inversely proportional to distance from the charge and so the minimum potential (V = 0) will be at infinity.
2] Electric field is given by:
E = - V/d
so, for a constant separation of plates d, if the potential difference V is large, the electric field will also be large.
therefore, electric field for [3] (potential difference of 100 volts) will be the highest followed by [1] (potential difference of 90 volts) followed by [4] (potential difference of 60 volts) and then lastly [2] (potential difference of 50 volts).
So, the answer is [C].
3] R1 and R3 are connected in series and hence [c] cannot be the answer.
The sum of R1 and R3 is parallel to R2
hence the answer is [d].
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