Question

An element ∆l = ∆xI is placed at the origin and carries current I = 2A. Find out the magnetic field at point P on the y axis at a distance of 1 m due to the element ∆x = w cm. Also give the direction of the field produced.

Answer 1

dB=4πμ0​​r2±dLsinθ​

      =4π4π×10−7​×0.5×0.510×1×10−2×sin90​T

( The axis of element and y-axis are perpendicular to each other )

      =4×10−8T

⇒dB

=4πμoI​×r3dL

×r

​

⇒dI

×r

=dxi^×yj^​

                 =ydx(i^×j^​)

                 =ydxu^

Therefore the direction of dB

is in the +z direction.  

Hence, the answer is 4×10−8T.

Explanation:

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