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*x-y* plane oriented in the *z*-direction as shown in Fig. 7.5. Calculate the magnitude and direction of magnetic field intensity at point P.

Due to current in conductor a; direction is shown in Fig. 7.4 by the right-hand rule

H_{a} = \frac{4}{2π × 20 × 10^{-2} } = \frac{10}{π} A/m

Similarly

H_{b} = \frac{10}{π} A/m

Adding the two vectors

\overline{H} = \sqrt{2} H_{a} ∠ 90° + 45°

\overline{H} = \frac{10 \sqrt{2}}{π} ∠ 135° A/m