Answer:
Explanation:
We define the linear density of charge as:
Where L is the rod's length, in this case the semicircle's length L = πr
The potential created at the center by an differential element of charge is:
where k is the coulomb's constant
r is the distance from dq to center of the circle
Thus.
Potential at the center of the semicircle
4
(m)
2 ( s )
ok...........
Answer: lower frequency and a longer wavelength
20m
420=80m
100
increases
increases then decreases