A circular metal disk with a shaft through its center rotates about a central ax
ID: 1261868 • Letter: A
Question
A circular metal disk with a shaft through its center rotates about a central axis as shown in (Figure 1) . The unit is placed in a uniform magnetic field of magnitude 1.3T , 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.
Figure 1:
If the disk radius is 100 mm and the disk completes 300 rotations per minute, what is the value of the emf induced between the two contacts?
V= ?
A circular metal disk with a shaft through its center rotates about a central axis as shown in (Figure 1) . The unit is placed in a uniform magnetic field of magnitude 1.3T , 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. If the disk radius is 100 mm and the disk completes 300 rotations per minute, what is the value of the emf induced between the two contacts? V= ?Explanation / Answer
since rotation plane of the disk is always perpendicualr to the magnetic field so, magnetic flux linked with the rotating disk remains same hence no emf induced.
because = induced emf = - d(magnetic flux)/dt
induced emf = 0
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