JEE Main 2025 Physics question

A uniform magnetic field of 0.4 T acts perpendicular to a circular copper disc 20 cm in radius. The disc is having a uniform angular velocity of 10π rad s⁻¹ about an axis through its centre and perpendicular to the disc. What is the potential difference developed between the axis of the disc and the rim ? (π = 3.14)

• (1)0.0628 V
• (2)0.5024 V
• (3)0.2512 VCorrect
• (4)0.1256 V