They both are objects u can get chocked by
As we know that magnetic field strength due to solenoid is given by
here we know that
= permeability of air medium
N = number of turns
L = length of solenoid
i = electric current
Now as we enter the iron rod into the solenoid the medium will get change that will increase the permeability
so with the iron rod we will have
so correct answer will be
<u>It increases the magnetic field’s strength. </u>
Answer:
0.2687 approximately 0.27
Explanation:
Diameter = 0.320
Speed = 40.0 rev/min
We are required to find coefficient of static friction between friction and button
The radius can be calculated as
0.320/2
= 0.160m
Then we have the rotational speed w = 40rev/min x 2pi/60
= 4.19 rad/s
umg = mrw²
u = mrw²/mg
u = rw²/g -------(1)
g = 9.8
When we put values into equation 1
0.150m x 4.19² / 9.8
= 0.150m x 17.5561 /9.8
= 0.2689
This is approximately 0.27
C
because 40 j dived by 5 seconds is 8 work