Ampere's circuital law is given by:

\oint ¯ H . ¯ d l = μ_{0} I_{e n c}

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\oint ¯ B . ¯ d l = μ_{0} I_{e n c}

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\oint ¯ B . ¯ d l = μ_{0} I

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\oint ¯ H . ¯ d l = μ_{0} I

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Solution

The correct option is B $\oint ¯ B . ¯ d l = μ_{0} I_{e n c}$
The line integral of the magnetic field of induction $\to B$ around any closed path in free space is equal to absolute permeability of free space $μ_{o}$ times the total current flowing through area bounded by the path.
Ampere's circuital law is given by:
$\oint \to B . d \to l = μ_{0} I_{e n c}$
The correct option is B.

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