A rod of length \( 60 \, \text{cm} \) rotates with a uniform angular velocity \( 20 \, \text{rad s}^{-1} \) about its perpendicular bisector, in a uniform magnetic field \( 0.5 \, \text{T} \). The direction of magnetic field is parallel to the axis of rotation. The potential difference between the two ends of the rod is _______________ \( \text{V} \).
