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# Find the direction of the current in the resistor shown in Figure P20.16 (a) at the instant the switch is closed, (b) after the switch has been closed for several minutes, and (c) at the instant the switch is opened.

## a. to the left b. zeroc. \text { to the right }

### Discussion

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##### Andy C.

University of Michigan - Ann Arbor

##### Jared E.

University of Winnipeg

### Video Transcript

So we were asked to find the direction of the current shown and figure P 20-16 for three different cases. So for part A at the instant in which the switch is closed. Okay. So to find the direction of the current and the resistor at the instant of which is closed at that instance, the induced current in the resistor is in the right toe left direction in the current. Therefore, the direction of the current is right to left in the resist her so we can go ahead and write here for part a right two left Mrs Part, eh? We'll box that in the situation Rast to consider for part B is after the switch has been closed for several minutes. So there is no current passing through the resist her in the right circuit as there is no change in flux due to the switch being closed for a long duration of time. Therefore, the current does not pass through the resistor. And so for part B, we can say no current in resistor. Go ahead and box it in is our solution for part B and lastly for us to consider situation see where at the instance the switch is open. So as the switches opened, the induced current and the resistor is going to be left to right direction. Therefore, the direction of the current the resistor is left to right, so go ahead and write left to right.

University of Kansas
##### Andy C.

University of Michigan - Ann Arbor

##### Jared E.

University of Winnipeg