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# In Ampere's ∮ → B ⋅ d → l = μ 0 i , the current outside the curve is not included on the right hand side. Does it mean that the magnetic field B calculated by using Ampere's law - Physics

Short Note

In Ampere's  $\oint \vec{B} \cdot d \vec{l} = \mu_0 i,$ the current outside the curve is not included on the right hand side. Does it mean  that the magnetic field B calculated by using Ampere's law, gives the contribution of only the currents crossing the area bounded by the curve?

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#### Solution

In Ampere's law $\oint \vec{B} . \vec{dl} = \mu_o i$ , i is the total current crossing the area bounded by the closed curve. The magnetic field B on the left-hand side is the resultant field due to all existing currents.

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#### APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 13 Magnetic Field due to a Current
Short Answers | Q 4 | Page 248
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