Consider a loop of wire with a resistor. in the same plane, (with switch s closed) a long wire has a current i flowing from right to left. bancroft (acb3943) – hw06 – lai – (55310) 3 r i s if switch s is open for a long period of time, and then suddenly closed, what is the direction of the induced current through r as the current i rapidly increases? 1. the current flows left to right through r. 2. the current flows right to left through r. 3. there is no current flow.

1) The current flows left to right through r

Explanation:

When the switch S is suddenly closed, current begins to flow in the wire, then a magnetic field is created in the wire due to this flow of current. The magnetic field flows out of the page right to left.

A current is induced in the wire due to the magnetic field, this induced current  , according to lenz's law, opposes the magnetic field. Therefore, this induced current causes the magnetic field to move into the page which implies that the current will flow from left to right in r.

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