15. (10 points) What is the capacitance of a capacitor holding 7.5 10-5 C of cha

Question

15. (10 points) What is the capacitance of a capacitor holding 7.5 10-5 C of charge if a 15 V potential is placed across it? C. 7.5 F D. 15 F E. 75 F 16. (10 points) Why do we say that potential difference is a relative term A. Because the quantity does not require an absolute frame of reference for po- tential B. Because there is no such thing as 0 V. C. Because the earth's potential (called ground) maintains 0 V. D. Because all units in physics are relative E. Because we have not yet discovered a absolute frame of reference for electrical potential 17. (10 points) Two 12 F capacitors are placed in series. What is the net charge across these capacitors if they are connected to a 1.5 V battery? A. 36 uC B. 12 uC C. 9 uC D. 6 C E. 1.5 C

Explanation / Answer

15) we know, Q=C*V

C=Q/V= 7.5*10-5/15 = 5*10-6 farads

Option B is correct

16) option c is correct all potentials are written with respect to earth's potential taken as 0 V

17) net capacitance= C1*c2/C1+c2

= (12*12)/24=6 uF

= 6*10-6 F

Q=C*V=6*10-6*1.5

Q=9*10-6 coloumbs

Option C is correct

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