A. Using Lenz\'s law, determine the direction of the current in resistor a b in

Question

A. Using Lenz's law, determine the direction of the current in resistor ab in the figure when switch Sis opened after having been closed for several minutes.

B. Using Lenz's law, determine the direction of the current in resistor ab in the figure when coil B is brought closer to coil A with the switch closed.

C. Using Lenz's law, determine the direction of the current in resistor ab in the figure when the resistance of R is decreased while the switch remains closed.

A. Using Lenz's law, determine the direction of the current in resistor ab in the figure when switch Sis opened after having been closed for several minutes. B. Using Lenz's law, determine the direction of the current in resistor ab in the figure when coil B is brought closer to coil A with the switch closed. C. Using Lenz's law, determine the direction of the current in resistor ab in the figure when the resistance of R is decreased while the switch remains closed.

Explanation / Answer

When current in the resistor ab is opened

the current in the coil A will decrese , and this will decrese flux through coil B

Hence , according to lenz law ,

current will flow from a to b

B)

when the coil are brought closer,

the field in the coil B is oposite to field due to A

Using Lenz's law

Current is from b to a

c)

for Resistance R is decrease , I will increase

and the flux due to A will increase ,

Hence ,

Using Lenz's law

Current is from b to a

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