Application of Ampere’s Circuital Law

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics:

Application of Ampere’s Circuital Law:

Magnitude of Magnetic Field of a Straight Wire (Infinite) Using Ampere’s Law:

Magnetic field due to a straight conductor at point P, at a distance r from the wire.

Now, We will draw a circle with radius r, passes through point P (called amperian loop).

By using Right Hand Thumb Rule, we can see that magnetic field is tangential with dl at all place, then angle between B and dl is zero.

So by first case of Ampere’s Law we can apply it.

 

 

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