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A small, circular ring is inside a large...

A small, circular ring is inside a larger loop that is connected to a battery and a switch as shown in Fig. 3.25. Use Lenz's law to find the direction of the current induced in the small ring
(a) just after switch `S` is closed,
(b) after `S`has been closed for a long time,
( c) just after `S` has been reopened after being closed for a long time. ltbr.

Text Solution

Verified by Experts

(a) `Phi_(B)` is `o.` and increasing so the flux `Phi_(i nd)` of the induced current is clockwise.
(b) The current reaches a constant value so `Phi_(B)` is constant `dPhi_(B)//dt = 0` and there is no induced current. ltbr. ( c) `Phi_(B)` is `o.` and decreasing, so the flux `Phi_(ind)` is `o.` and current is counter clockwise.
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