11. An ideal battery and ten identical resistors are c onnected in parallel. The

Question

11. An ideal battery and ten identical resistors are c onnected in parallel. The current flowing through the battery is 1.0 A. Now we add another resistor (identical with the other ten) across the battery. The current through the battery becomes A) 0.0091 A B)0.091 A C)091 A D) .1A E) 1I A 12. What multiple of the time constant gives the time taken by an initially uncharged capacitor in an RC series circuit to be charged to 991% of its final charge? A) 4.71 B) 2.23 C)1.73 D) 1.69 E) 5.33 13. A particle of mass 22.0 g and charge 150 C moves in the horizontal direction with constant speed. with B = 1.20 T. The constant speed of the particle is A uniform magnetic field, pointing into the page, exists in this region, A) 00118 km/'s B) 0.12 km/s C) 1.20 km/'s D) 12.0 km/s E) 118 km/'s

Explanation / Answer

11) Let the resistor be R

R(total) = R/10

I = 10V/R = 1

when one more resistor is added

R(total) = R/11

I = 11V/R = 11*1/10 = 1.1 A

so option D) is the correct answer

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