Two identical short bar magnets are placed at $120^{\circ}$ as shown in the figure. The magnetic moment of each magnet is $M$. Then the magnetic field at the point $P$ on the angle bisector is given by

213739-q

  • A

    $\frac{\mu_0}{4 \pi} \cdot \frac{M}{d^3}$

  • B

    $\frac{\mu_0}{4 \pi} \cdot \frac{2 M}{d^3}$

  • C

    $\frac{\mu_0}{4 \pi} \cdot \frac{2 \sqrt{2} M}{d^3}$

  • D

    $0$

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