Two concentric current loops lie in the same plane. the smaller loop has a radius of 3.6 cm and a current of 12 a. the bigger loop has a current of 20 a . the magnetic field at the center of the loops is found to be zero. what is the radius of the bigger loop?

the radius of bigger loop = 6 cm

Explanation:

given,

two concentric current loops

smaller loop radius = 3.6 cm

]current in smaller loop = 12 A

current in the bigger loop = 20 A

magnetic field at the center of loop = 0

Radius of the bigger loop = ?

now, on solving

       =

       = 6 cm

hence, the radius of bigger loop = 6 cm

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explanation: