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Question

Question: In the figure shown the magnetic field at the point P is ![](https://cdn.pureessence.tech/canvas_36...

In the figure shown the magnetic field at the point P is

A

2μ0i3πa4π2\frac { 2 \mu _ { 0 } \mathrm { i } } { 3 \pi \mathrm { a } } \sqrt { 4 - \pi ^ { 2 } }

B

C

2μ0i3ππ(4+π2)\frac { 2 \mu _ { 0 } i } { 3 \pi \pi } \left( 4 + \pi ^ { 2 } \right)

D

2μ0i3πa(4π2)\frac { 2 \mu _ { 0 } \mathrm { i } } { 3 \pi \mathrm { a } } \left( 4 - \pi ^ { 2 } \right)

Answer

Explanation

Solution

Where (B1)p=μoi4π(3a2)(j^)\left( \overrightarrow { \mathrm { B } } _ { 1 } \right) _ { \mathrm { p } } = \frac { \mu _ { \mathrm { o } } \mathrm { i } } { 4 \pi \left( \frac { 3 \mathrm { a } } { 2 } \right) } ( - \hat { \mathrm { j } } ) (semi-infinite wire)

(B2)p=μoi4(3a2)(+k^)\left( \overrightarrow { \mathrm { B } } _ { 2 } \right) _ { \mathrm { p } } = \frac { \mu _ { \mathrm { o } } \mathrm { i } } { 4 \left( \frac { 3 \mathrm { a } } { 2 } \right) } ( + \hat { \mathrm { k } } ) ,

, (B5)p=μoi4π(a2)(j^)\left( \overrightarrow { \mathrm { B } } _ { 5 } \right) _ { \mathrm { p } } = \frac { \mu _ { \mathrm { o } } \mathrm { i } } { 4 \pi \left( \frac { \mathrm { a } } { 2 } \right) } ( - \hat { \mathrm { j } } )

.

Hence (2) is correct