#1 Using Lenzs law, determine the direction of the current in the resistor ab wh
ID: 1399171 • Letter: #
Question
#1 Using Lenzs law, determine the direction of the current in the resistor ab when: (a.) Switch S is opened after being closed for several minutes. (b.) Coil B is brought closer to coil A with the switched closed. (c.) The resistance R is decreased while the switch remains closed. For full credit, you must give a detailed explanation of the direction of the original magnetic field, whether the flux is increasing or decreasing, the direction of the induced magnetic field, and finally, the direction of the induced current.Explanation / Answer
1) a) whenever there is a chnge in magnetic flux through the coil,then only current is induced in the coil
When Switch S is opend after being closed for several minutes
When S is opend ,then there is o current in the coil A,hnece no current induced in coil B
B) Coil B is brought closer to coil A with the switched closed
then magnetic flux increases in coil B,then the induced current opposes the increase of flux
for this act the direc tion of currenu in coil B is fro b to a
C) if R is decresed then current in coil A increases then by more no.of field lines passes through B and increasing flux in coil B,so the induced cuurrent opposes the increase of flux
So the direction of induced current is from b to a
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