Question 17: NCERT Solutions for 12th Class Physics: Chapter 6-Electromagnetic Induction
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. A uniform magnetic field extends over a circular region within the rim.
It is given by = o (otherwise) What is the angular velocity of the wheel after the field is suddenly switched off?
According to Faraday’s law of electromagnetic induction the induced emf is
Thus a relation between electric field and rate of change of flux can be established,
E exist along circumference of radius ‘a’ due to change in magnetic flux.
Linear charge density on rim is A. So, total charge on rim Q = λ2πa …(ii) Electric Force on the charge
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NCERT Solutions for 12th Class Physics: Chapter 6-Electromagnetic Induction