For a point charge, how does the potential vary with distance from the point charge, r?
a constant
b. r.
c. 1/r.
d. 
.
e. 
.
Answer:
The correct option is C
Explanation:
Generally for a point charge the electric potential is mathematically represented as
Here we can deduce that the electric potential varies inversely with the distance i.e
So
Answer:
Both hemispheres receive the same amount of sunlight during <em>both autumnal equinox and vernal equinox
</em>
Explanation:
The vernal or spring equinox happens around March 20 or thereabouts yearly. Equinoxes and various seasons happen as the Earth orbits the Sun and the Earth's orbit. Thus, we have Autumn equinox and spring or vernal equinox. During the Northern hemisphere spring and summer, the northern hemisphere is tilted towards the sun while during the Autumn and winter the northern hemisphere is tilted away from the sun.
During the autumn and spring equinoxes, the earth is neither tilted away or towards the sun. This means that both northern and southern hemisphere receive equal sunlight during these periods: that is hours of daylight and night are roughly about the same.
Distance and proper motion
Answer:
(a) 1560 W
(b) 576 W
(c) 1.01
Explanation:
Voltage, V = 120 V
Current in dryer, I = 13 A
current in vacuum cleaner, i' = 4.8 A
(a) Power consumed by dryer,
P = V I = 120 x 13 = 1560 W
(b) Power consumed by vacuum cleaner
P' = V I' = 120 x 4.8 = 576 W
(c) Energy consumed by dryer
E = P x t = 1560 x 15 x 60 = 1404000 J
Energy consumed by the vacuum cleaner
E' = P' x t' = 576 x 40 x 60 = 1382400 J
the ratio of energies is
E : E' = 1404000 : 1382400 = 1.01
