Question 6.17: A line charge λ per unit length is lodged uniformly onto the rim of a wheel of mass M and radius R. The wheel has light non-conducting spokes and is free to rotate without friction about its axis (Fig. 6.22). A uniform magnetic field extends over a circular region within the rim. It is given by, B = − B0 k (r ≤ a; a < R) = 0 (otherwise) What is the angular velocity of the wheel after the field is suddenly switched off?
Class 12 - Physics - Electromagnetic Induction Electromagnetic Induction Page-232
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according to Faraday law of electromagnetic induction,
the induced emf is
thus, a relation between electric field and rate of change of flux can be established.
e.g.,
exist along circumstance of radius 'a' due to change in magnetic flux.
Linear charge density on rim is .so,total charge on rim is
so, F = QE =
in term of angular velocity,
now, integrate both sides,
As direction of Angular velocity is along axis.
the induced emf is
thus, a relation between electric field and rate of change of flux can be established.
e.g.,
exist along circumstance of radius 'a' due to change in magnetic flux.
Linear charge density on rim is .so,total charge on rim is
so, F = QE =
in term of angular velocity,
now, integrate both sides,
As direction of Angular velocity is along axis.
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