If a single circular loop of wire carries a current of 61 A and produces a magnetic field at its center with a magnitude of 1.70 10-4 T, determine the radius of the loop.

The  radius is  

Explanation:

From the question we are told that

    The current is  

     The  magnetic field is  

Generally the magnetic field produced by a current carrying conductor  is mathematically represented as

=>    

Here   is the permeability of free space with value  

=>    

=>  

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.