Magnetic field due to currentHard
Question
Circular loop of a wire and a long straight wire carry currents IC and Ie respectively as shown in figure. Assuming that these are placed in the same plane, the magnetic fields will be zero at the centre of the loop when the separation H is :
Options
A.
B.
C.
D.
Solution
Magnetic field due to straight wire = 
Magnetic field due to circular wire =
Now =
⇒ H =
Magnetic field due to circular wire =
Now =
⇒ H =
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