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  • Consider a coil of wire carrying current I, forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by <img alt="\phi" src="https://learn.career

Consider a coil of wire carrying current I, forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by \phii. The magnetic flux through the area given by \phio. Which of the following is correct?
 
Option: 1 \phii = -\phi_o
Option: 2 \phii > \phi_o
Option: 3 \phii < \phi_o  
Option: 4 \phii = -\phi_o
 

Answers (1)

best_answer
 

Magnetic flux - - wherein

Magnetic flux-

The total number of magnetic lines of force passing normally through an area placed in a magnetic field is equal to
the magnetic flux linked with that area.

I.e for the below figure

Net magnetic flux through the surface is given by

\phi_B = \oint \vec{B}\cdot \vec{dA}= BA\cos \Theta

where 

\phi_B= Magnetic Flux

B = Magnetic field 

\Theta = The angle between area vector and magnetic field vector

 

 

    

Flux going right comes back to the left (forms closed loop)

\int B.dA=0

Flux inside the coil come bach through outside

\\\phi _{coil}= -\phi _{out\ side}\\\phi_0= - \phi_i

 

So option (4) is correct.

Posted by

Ritika Jonwal

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