Physics - EMI/AC Question with Solution | TestHub
Match the following motional EMF scenarios with the magnitude of the induced EMF.
List - I | List - II |
|---|---|
(P) A conducting rod of length moving with velocity perpendicular to a uniform magnetic field | (1) |
(Q) A conducting rod of length rotating with angular velocity about one end, perpendicular to a uniform magnetic field acting along the axis of rotation | (2) |
(R) A conducting rod of length rotating with angular velocity about one end, perpendicular to a uniform magnetic field acting perpendicular to the plane of rotation | (3) |
(S) A conducting rod of length moving with velocity parallel to a uniform magnetic field | (4) |
Options:
Answer:
Solution:
For a rod moving with velocity perpendicular to , the induced EMF is (P-1). If the rod rotates about one end with angular velocity and is along the axis of rotation, the velocity of charge carriers is parallel to , so no EMF is induced (Q-2). If the rod rotates perpendicular to (B perpendicular to the plane of rotation), the induced EMF is (R-3). If the rod moves parallel to , the magnetic force on charges is zero, so no EMF is induced (S-2).
