Question

The resulting magnetic field at the point O due to the current carrying wire as shown

• A. points out of the page
• B. points into the page
• C. is zero
• D. is the same as due to the segment WX along.

Answer 1

The correct option is B points into the page

The feild is due to current carrying coil sectiob AB,BC and CD.

Field due to $AB\overrightarrow{B_{AB}}=\overrightarrow{I}\times \overrightarrow{r_1}$ into the page.

Field due to $BC\overrightarrow{B_{BC}}=\overrightarrow{I}\times \overrightarrow{r_2}$ into the page.

Field due to $CD\overrightarrow{B_{CD}}=\overrightarrow{I}\times \overrightarrow{r_3}$ into the page

Resultant field $B=\overrightarrow{B_{AB}}+\overrightarrow{B_{BC}}+\overrightarrow{B_{CD}}$ into the page.