Physics Magnetism: Ring Behavior When Switch is Closed

[clovergogo]

Homework Statement

http://upload.lsforum.net/users/public/c7843Untitleda235.jpg

when the switch is closed
what happen to the golden ring when the switch is closed? explain

the switch remains closed. what happen to the ring if the slide contact of the rheostat
i) is kept at A
ii) moves from A to B
iii) oscillates to and fro between A and B continuously with 1 Hz ?

explain the aboves

Homework Equations

it is a theorem about induced current

The Attempt at a Solution

i am wondering when it contact at A the resistance decreases, so the current increases of circuit, then y the golden ring remain stationary?

 

[Greg Bernhardt]

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