A vertical disc of diameter 10 cm makes 20 revolutions per second about a horizontal axis passing through its centre. A uniform magnetic field `10^(-1)` T acts perpendicular to the plane of the disc. Calculate the potential difference between its centre and rim in volts.

Explanation

To solve the problem, we need to calculate the potential difference (EMF) between the center and the rim of a rotating disc in a magnetic field. Here’s a step-by-step solution:

### Step 1: Identify Given Values
- Diameter of the disc = 10 cm = 0.1 m
- Radius of the disc (R) = Diameter/2 = 0.1 m / 2 = 0.05 m
- Revolutions per second (n) = 20 rps
- Magnetic field (B) = \(10^{-1}\) T = 0.1 T

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