The follonsing pertains to the questions 16-19 Consider the Sollowing circuit. T

Question

The follonsing pertains to the questions 16-19 Consider the Sollowing circuit. The negative end of the battery is at sero volts Amsume that the battery has no internal resistance 2 4 A-o oV 16. What is the electric potential at point A? (A) 12 V (B) 8 V (C) 4 v (Do v 17. What is the electric potential at point B? (A) 12 V (B) 8V (C)6V (D) 4 V 18. What is the electric potential at point C? (A) 12 V (B)8 V (C) 6 V (D) 4 V 19. What is the current through the battery? (C) 3A (D) -][ 12:1 (A) 1A (B) 2A 4 A 20. When a capacitor discharges through a resistor, the voltage across the pacitor is maximum (A) at the beginning of the process. (B) at the middle of the process. (C) at the end of the process. (D) after one RC time constant. 21. Bonus: A capacitor of capacitance C is made up of parallel con nlates . If I insert a metal slab of thickne separated bv a distanced

Explanation / Answer

18. Consider the left end of 4ohm resistor as D and right end of 2 ohm resistor as E.

Now we know that the equivalent resistance will be 6ohms (series connection)

so the current through that branch is 12/6 = 2A

Now, VC - VD = current x 4

VD = 0 So

Vc = 2 x 4 = 8 volts

hence option B is correct.

  

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