Q. 23

# Find the magnetic

Answer :

Let us consider two angles made by points A and B with point O be θ_{1} and θ_{2} respectively.

θ_{1} = θ_{2} = θ

Let distance of the point from the wire

In triangle

Thus induced magnetic field due to AB is given by,

⇒

⇒

⇒

Similarly the induced magnetic field due to current in BC is given as:

Now, magnetic field due to CD = magnetic field due to current in wire AB =B

Also, magnetic field due to current in wire DA = magnetic field due to current in wire BC =B’

∴

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