Error in calculation, can any anyone assist in the error I made?

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Snakedoctor

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My professor got the answer as 21.0, but when I solved it like given in the image written in pencil I got it as 0.021. Can anyone explain how is this possible?
Given : N = 20 , a= 4 cm (0.04m) , µ0 = 4π x 10-7 N/A2 , I = 67mA. The formula used is given in the picture. Thanks.
 

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Snakedoctor said:
My professor got the answer as 21.0, but when I solved it like given in the image written in pencil I got it as 0.021. Can anyone explain how is this possible?
Given : N = 20 , a= 4 cm (0.04m) , µ0 = 4π x 10-7 N/A2 , I = 67mA. The formula used is given in the picture. Thanks.
Click to expand...
I is given in mA; for consistency of units, I has to be in amperes, so you need to use I = 0.067 A.

Having carried that out, I see that you must have done that. Maybe they didn't?
 
Dr.Peterson said:
I is given in mA; for consistency of units, I has to be in amperes, so you need to use I = 0.067 A.

Having carried that out, I see that you must have done that. Maybe they didn't?
Click to expand...
However when i use 0.067A the answer comes to 0.0000210
 
Is it because as per the observation table it shows the answer written in microtesla unit. And microtesla is 10-6 . If so then the answer would be 21.0 ? Is it?
 
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