A circular metal disk with a shaft through its center rotates about a central axis as shown in Figure P29.33. The unit is placed in a uniform magnetic field of magnitude \(1.5 \mathrm{~T}\), directed parallel to the shaft. Two small sliding contacts are placed against the unit, one touching the edge of the disk and the other touching the end of the shaft.

(a) If the disk radius is \(100 \mathrm{~mm}\) and the disk completes 300 rotations per minute, what is the value of the emf induced between the two contacts?

(b) Which contact is at the greater potential?

Data from Figure P29.33

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B