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  • Two long thin wire ABC and DEF are arranged as given , The magnitude of the magnetic field at O is  <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAS8AAAC4CAIAAAA9qP3AAAAgAE

Two long thin wire ABC and DEF are arranged as given , The magnitude of the magnetic field at O is 

Option: 1

\frac{\mu _0I}{4\pi r }


Option: 2

0


Option: 3

\frac{\mu _0I}{2\pi r}


Option: 4

\frac{\mu _0I}{2\sqrt 2\pi r}


Answers (1)

best_answer

As we have learned

For Semi Infinite length -

\phi_{1}=90^{\circ}\:\phi_{2}=0^{\circ}

B=\frac{\mu_{o}}{4\pi}\:\frac{i}{r}

- wherein

 

 at 0 due to wire AB and DE , B will be 0 . Due to BC , B = \frac{\mu _0i}{4\pi r}[\sin \alpha + \sin \beta ]

\alpha = 90 \degree\; \; \beta = 0

 and DF is also equal but opposite in direction so net B=0

 

 

 

 

 

Posted by

manish

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