Question

The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on

• A. amount of current flowing through the conductor
• B. amount of voltage supplied to the conductor
• C. size of conductor
• D. shape of the conductor

Answer 1

The correct option is D shape of the conductor

We know that;

$\overrightarrow{B}=\frac{{\mu }_0}{4\pi }\int \frac{Idl\times \overrightarrow{r}}{{\left|r^1\right|}^3}$

Where, $\overrightarrow{B}$ is magnetic field, $\overrightarrow{I}$ is current.

Thus magnitude of $\overrightarrow{B}$ depend on I, but pattern of magnetic field depend on shape of conductor as the direction of magnetic field is obtained used Cut finger rule i.e, pointing right hand thumb in current direction, Curl fingers describes direction thus pattern.