A circular copper disc 100cm in radius rotates at `20pi "rad"//s` about an axis through its centre and perpendicular to the disc. A uniform magnetic field of 0.2T acts perpendicular to the disc. Calculate the potential difference developed between the axis of the disc and the rim

Explanation

To solve the problem of calculating the potential difference developed between the axis of a rotating copper disc and its rim in a magnetic field, we can follow these steps:

### Step 1: Identify the Given Values
- Radius of the disc (r) = 100 cm = 1 m
- Angular velocity (ω) = 20π rad/s
- Magnetic field (B) = 0.2 T

### Step 2: Use the Formula for EMF Induced
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