Question

The correct expression for Ampere's law is :

• A. $\int B.dl=\sum i$
• B. $\int B.dl=\frac{1}{\sum i}$
• C. $\int B.dl={\mu }_0\sum i$
• D. $\int B.dl=\frac{\sum i}{{\mu }_0}$

Answer 1

The correct option is C $\int B.dl={\mu }_0\sum i$

Amper's law is $\oint \overrightarrow{B}.\overrightarrow{dl}={\mu }_0\sum i$ where $i$ is the sum of enclosed currents by the loop.