Download Q13 - Helios

Qwizdom questions for Dec. 17, 2009
16. Which of the following is not a vector?
A.
B.
C.
D.
electric force
electric field
electric potential
electric line of force
16.
The correct answer is C, electric
potential, V.
17. One joule per coulomb is a
A.
B.
C.
D.
newton
volt
electron-volt
farad
17.
The answer is B, a volt.
Recall that
PE
electric potential difference  V 
q
So, using units:
1 volt = 1 joule/coulomb
18.The potential at a distance of 2.0 m
from a positive point charge is 100 V.
What is the potential 4.0 m away
from the same point charge?
A.
B.
C.
D.
25 V
50 V
200 V
400 V
18.
The answer is B, 50 volts.
kQ
V
r
So if r is doubled, V will be ½ as large.
19.The potential at the exact center of a
square is 3.0 V when a charge of +Q is
located at one of the square's corners.
What is the potential at the square's
center when each of the other corners is
also filled with a charge of +Q?
A) zero
B) 3.0 V
C) 9.0 V
D) 12 V
19.
The correct answer is D, 12 V.
Since V is a scalar quantity and the
distance from the center to each corner
is the same,
V2  4V1  4 (3 V) = 12 V
20. The electron-volt is a unit of
A.
B.
C.
D.
voltage
current
power
energy
20.
The correct answer is D, energy.
1 eV = (1.60 10-19 C) (1 V) = 1.60 10-19 J
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