Answer:
The value is 
Explanation:
From the question we are told that
The length of the solenoid is 
The magnetic field is 
The current is 
The desired temperature is 
Generally the magnetic field is mathematically represented as

=> 
Here
is the permeability of free space with value

So

=> 
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Answer:
magnification will be -0.025
Explanation:
We have given the radius of curvature = 12 cm
And object distance = 3 m
So focal length 
Now for mirror we know that
So 

v = 0.750 m
Now magnification of the mirror is 
Answer:
80m
Explanation:
u=20,R=?,sin theta=1,g=10
R=u²sin2theta/g
R=20²x2/10
R=400x2=800/10
R=80m
Answer:
The wavelength in miles is <u>0.1165 miles</u>.
Explanation:
Given:
Wavelength of the radio wave is 187.37 m.
Now, the wavelength is given in meters.
We need to convert the wavelength from meters to miles.
In order to convert meters to miles, we have to use their conversion factor.
We know that,
1 meter = 
Therefore, the conversion factor is given as:

So, the wavelength in miles is given as:

Hence, the wavelength in miles is 0.1165 miles.