I don't understand that I'm sorry what grade is that
Answer:
0.075A
Explanation:
V = IR
where V - voltage, I - current, R - resistance
Hence, 18 = I * 240
I = 18/240
I = 0.075A
yes because it has to reduce frition by its own method called fellding
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