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  • State Ampere's circuital law. Use this law to find magnetic field due to straight infinite current carrying wire. How are the magnetic field lines different from the electrostatic field lines?   <div style="float:left; width:4

State Ampere's circuital law. Use this law to find magnetic field due to straight infinite current carrying wire. How are the magnetic field lines different from the electrostatic field lines?

 

 

 

 
 
 
 
 

Answers (1)

Ampers circular law

The line integral of the magnetic field around any closed path is equal to \mu_{o} times the current enclosed by the path.

\oint B.dl=\mu_{o}I\; enclosed

Consider an infinitely long straight wire carrying current I.

The Amperian loop is a circle

\oint B.dl=\mu_{o}I

B\times 2\pi r= \mu_{o}I

B= \frac{\mu_{o}I}{2\pi r}

is the magnitude of the magnetic field due to straight infinite current-carrying wire at a distance r from it.

\rightarrow magnetic field lines forms closed loops.

\rightarrow Electric field lines originate from positive charge and end at a negative charge.

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Safeer PP

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