Texas A&M; University Corpus Ch Summer 2015 Temm ixam 11. In the Figure 4, the a

Question

Texas A&M; University Corpus Ch Summer 2015 Temm ixam 11. In the Figure 4, the ammeter reads 6A volimeter reads asv, Ifue eml orthe battery is 60v,what is the internal resistance the of the battery? (A) 10.8v (B) 10 n (C) 8.00 (b) 140 2.00 12. A circuit is composed of battery and two di Terent resistors connected in series to each other, Which of the following statements is comect? (A) The smaller resistor carries more current. The larger resistor carries more current. (C) The current in each resistor is the same. Figure 4 V (D) The voltage difference across each resistor is the same. (E The voltage difference is greatest across the resistor closest to the positive terminal. 13. Three wires are made of copper having circular cross sections. Wire 1 has a length Land radius r Wire 2 has a length 2L and radius r, Wire M3 has a length Land radius 2r. Which wire has the smallest resistance? (C) Wire M3 (D) All three wires have same resistance (B) Wire N1 14. An electron in y at rest accelerates through a difference ofsv,gaining kinetic energy, KE whereas a proton, also initially at rest, accelerates through a potential difference of-5V,gaining kinetic energy KEp. Which of the following relationships holds? (A) KE KEP 15. Resistors Ri and R2 are connected in series to an emf source that has negligible intemal resistance. What happened to the current through Ri when a third resistor Rais connected in parallel with R (C Current through RI decreases (B) Current through RI increases (A) Nothing 16. An electron moving with velocity Ve enters a uniform electric field that exists between plates A and Bas shown in Figure 5. Which one of the following statements about the electron is correct? (A) The electron will move in the same direction while slowing down. (B) The electron will keep its velocity constant. up. E (C) The electron will move in the same direction while speeding (D) The electron will move upward along a parabola. move downward along a par B Figure 5 (E) The electron w PHYS 2426-University Physics II-B 3

Explanation / Answer

11)
E) 2 0hms

here is the explanation
let r is the internal reistance and R is resistance connected out side.

R = V/I

= 4.8/0.6

= 8 ohms

now Apply, I = emf/(r+R)

r+R = emf/I

r = emf/I - R

= 6/0.6 - 8

= 10 - 8

= 2 ohms

12) c)

13) C)

14) A)

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