10+15+5+20=50ohms
5 ohms is a tenth of the total resistance.
226/10= 22.6 volts across 5 ohm resistor
Complete Question
The question image is in the first uploaded image
Answer:

Explanation:
From the question we are told that
Distance b/w Q mid point and P is given as x
Generally the equation for magnitude of the electric field at the point P is given as

where


Therefore


Therefore equation for magnitude of the electric field at the point P is

What do you mean by speed and motion
Answer:
Frequency = 658 Hz
Explanation:
The third harmonics of A is,

The second harmonics of E is,

The difference in the two frequencies is,
delta_f = 1320 Hz - 1318 Hz = 2 Hz
The beat frequency between the third harmonic of A and the second harmonic of E is,
delta_f = 

We have calculate the frequency of the E string when she hears four beats per second, then
delat_f = 4 Hz


Hope this helps!