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  4. A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular turn DMND of radius R. AB, BC parts are tangential to circular turn at N and D. Magnetic field at the centre of circle is :

Q. A very long wire is shown in figure carrying current . and parts are straight, long and at right angle. At wire forms a circular turn of radius .
parts are tangential to circular turn at and . Magnetic field at the centre of circle is :

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Solution:

We say we have 3 parts



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