6. The capacitance of a parallel-plate capacitor with plate area
A
and plate separation
d
is given
by:
A.
6
0
d/A
B.
6
0
d/
2
A
C.
6
0
A/d
D.
6
0
A/
2
d
E.
Ad/
6
0
ans: C
7. The capacitance of a parallel-plate capacitor is:
A. proportional to the plate area
B. proportional to the charge stored
C. independent of any material inserted between the plates
D. proportional to the potential di
f
erence of the plates
E. proportional to the plate separation
ans: A
8. The plate areas and plate separations of
f
ve parallel plate capacitors are
capacitor 1: area
A
0
, separation
d
0
capacitor 2: area 2
A
0
, separation 2
d
0
capacitor 3: area 2
A
0
, separation
d
0
/
2
capacitor 4: area
A
0
/
2, separation 2
d
0
capacitor 5: area
A
0
, separation
d
0
/
2
Rank these according to their capacitances, least to greatest.
A. 1, 2, 3, 4, 5
B. 5, 4, 3, 2, 1
C. 5, 3 and 4 tie, then 1, 2
D. 4, 1 and 2 tie, then 5, 3
E. 3, 5, 1 and 2 tie, 1, 4
ans: D
9. The capacitance of a parallel-plate capacitor can be increased by:
A. increasing the charge
B. decreasing the charge
C. increasing the plate separation
D. decreasing the plate separation
E. decreasing the plate area
ans: D
10. If both the plate area and the plate separation of a parallel-plate capacitor are doubled, the
capacitance is:
A. doubled
B. halved
C. unchanged
D. tripled
E. quadrupled
ans: C
Chapter 25:
CAPACITANCE
365