Four resistors are connected across an 9 V DC battery as shown in the figure. Th

Question

Four resistors are connected across an 9 V DC battery as shown in the figure. The current through the 9-Ohm resistor is closest to A) 0.25 A. B) 0.67 A. C) 0.75 A. D) 0.58 A. E) 0.42 A. Identify the junction nodes in the circuit shown in the figure down A) C and D B) A and B C) C and F D) E and F E) D and F For the circuit shown in the figure, the switch S is initially open and the capacitor voltage is 80 V The switch is then closed at time t = 0. What is the charge on the capacitor when the current in the circuit is 40 mu A? A) 1155 mu C B) 990 mu C C) 825 mu C D) 1100 mu C E) 1320 mu C

Explanation / Answer

7) 2 ohm and 4 ohm are in series,

R1 = 2 + 4 = 6 ohm

3 ohm and 9 ohm are in series,

R2 = 3 + 9 = 12 ohm

now R1, R2 and battery are all in parallel connection hence all elements will have same PD across them,

so V_R2 = 9 V

I = 9 / 12 =0.75 A

Ans(C)

8) (D) E and F

9) Vc = I R = (40 uA) (1.5 M ohm) = 60 Volt

Q= C Vc = (22 uF) (60 V) =1320 uC

Ans: (E)

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