Discussion
A tiny oscillating magnetic dipole is formed by circulating sinusoidal current in a circular loop in the xz-plane, with center at origin. Consider this as a perfect dipole. Power radiated by the dipole is minimum along :
Answer: B
The radiated power is minimum along the y-axis.
A current loop in the xz-plane has its magnetic dipole moment along the normal to the loop, the \( y \)-axis. Like an electric dipole, an oscillating magnetic dipole radiates with an intensity proportional to \( \sin^{2}\theta \), where \( \theta \) is measured from the dipole axis. So no power goes out along the axis itself.
The \( x \)-axis, the \( z \)-axis and the direction \( x\hat{x} + z\hat{z} \) all lie in the plane of the loop, at \( \theta = 90^{\circ} \) from the moment, where the radiation is maximum.
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