Solenoid Question - Magnetism Advanced Physics class?

Posted on 2016-03-10 18:52:00 in Physics by SERINA

Q.12: An infinite solenoid has radius b and n turns per unit length. 
The current varies in time according to I(t) = I0 cosωt (with 
positive defined as shown in Fig. Q.12). A ring with radius r < b 
and resistance R is centered on the solenoid’s axis, with its plane 
perpendicular to the axis. 
(a) What is the induced current in the ring? 
(b) A given little piece of the ring will feel a magnetic force. For 
what values of t is this force maximum? 
(c) What is the effect of the force on the ring? That is, does the 
force cause the ring to translate, spin, flip over, stretch/shrink, 
etc.?

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