A wire carrying current I in the form of y2 = 4ax is extended upto latus rectum. Find the current (I0) in the long wire along the directrix of parabola such that magnetic field at the focus of parabola is zero.

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Question

A wire carrying current I in the form of y² = 4ax is extended upto latus rectum. Find the current (I₀) in the long wire along the directrix of parabola such that magnetic field at the focus of parabola is zero.

$Ι_{0} = Ι (\frac{π}{2} - 1)$

$Ι_{0} = Ι (\frac{π}{2} + 1)$

$Ι_{0} = Ι (π + 1)$

$Ι_{0} = \frac{I}{2} \times (π - 1)$

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Use :

$B = \frac{µ_{0} I}{4 π} \int \frac{dθ}{r}$

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